One great historical case for Buffett was the Salad Oil Scandal. American Express stock plummeted because it had guaranteed loans backed by salad oil inventories that turned out to be fraudulent. It was facing a huge loss for the time, some were even afraid it might go out of business.
But Buffett went to lunch and saw customer after customer still using Amex cards to pay for their meals. He realized that the charge card part of Amex was still really valuable, and did the math on what the credit card business was worth and their maximum possible losses from their loans would be, and realized the stock was hugely undervalued and bought a ton.
Every business has remote risks of crazy bad things happening, it's why you diversify your portfolio if you are an active investor.
"Well if it's a belief, then isn't value investing just as much speculation as anything else?"
That's where the term Margin of Safety comes in. The financials of a company provide a delta, some min and max of where the company can go. When you plug in your estimates, and that delta's minimum is still less than the current price of the stock, esp by a significant margin, then you've picked a winner...more specifically, a winner over the next few years. Remember, plenty of events can occur between now and when your value is realized, and one of the other traits of a strong value investor is the ability to weather the storm. Oftentimes these companies with sufficient margin of safety will continue to fall in price before they rise again, one cannot time the market for the zenith nor the nadir of a stock's price.
Beyond that you spend time thinking about their business and what could go wrong. If there is something obvious to you they didn't disclose, that would tend to mean management is untrustworthy or incompetent, two other huge risks.
Buffett spends lots of hours reading reports away from CNN and computers and distractions. I'm sure he talks to Charlie and others regularly about things that concern him and gets different perspectives.
Leverage is only minor component of his late career success, and insurance float could never have gotten him broke. It's totally unlikely like a loan from your broker.
The reality is his late career is less impressive only in one way, annualized returns, and it's more impressive in virtually every other way. He started out with less than a million in investors money, and his 40% returns with the Buffett Partnership were probably with an average of $10M to $20M total.
Nowadays his public stock portfolio was $122B at year end 2016. That limits the stock market investments he can make to a tiny fraction of stocks. He's not going to buy hundreds of stocks, not even dozens. He wants to focus in his dozen or so best ideas. So he want to be able to put $10B to work in each and there are very few public companies with market caps and trading volumes large enough to allow him to do that. So problem #1 is that he went from a market of 5,000+ stocks he could choose from to maybe a few hundred, reduced opportunities that directly hurts his returns.
Worse, how can he accumulate $10B worth of a company before he's forced to publicly disclose his purchases. If he's forced to disclose prematurely, his future returns dwindle due to free-riders driving the purchase price up before he's done. That's big problem #2.
The fact that he's still beating the market carrying these heavy chains is more impressive to me than the fact he whipped it at 3x higher rates when he could buy anything he wanted.
While managing billions at minimal risk he is not making nearly 17% returns. He is doing OK but again your looking at a statistical outlier so you can't separate skill and luck as much as you might think.
His 40% returns were in the Buffett Partnerships, which ran for 12 years from mid 50s to late 60s, and aren't counted in Berkshires results.
Doubling the market return rate over 52 years is huge outperformance. For an investor it's roughly doubling every 3.5 years instead of 7.5 years.
Add in the fact he crushed the market by nearly 4x a year for an earlier 12 years and his immense skill is undeniable. He would be statistically implausible if the world had trillions of investors.
His annualized returns running the Buffett Partnerships with zero leverage were close to 40% per year for the dozen or so years they were operating.
And everyone compounds gains just by holding index funds for long periods. Buffett compounds them far faster because he has substantially higher returns than the market.
Some companies come with liabilities that are not in the books; such as having promised to guarantee their workers wages or retirement for decades. If you buy the company and close up shop, you might either be liable to cover these "soft costs" or you might cause political harm to your own operation.
Here's one story: https://www.usatoday.com/story/money/markets/2015/12/03/yaho...
Someone has to buy that though, right?
I'm sure a ton of people would buy a lot of pieces of a liquidated Apple, but what other effects on the economy does a suddenly-liquidated Apple have since it's such a major company? Does Apple take any other companies with it?
The only way to insulate yourself completely and still benefit is to only own Apple shares, otherwise, Apple going down is going to affect the rest of your position.
What if they continue to trade below the cash that they are holding for 10+ years?
Plus, since they use tax havens, what happens to that cash if someone did liquidate Apple? Wouldn't it have to come back to America and would be taxed heavily?
The returns can be very good, but you do need to diversify out to 10 to 20 holdings to limit risk from one going south or taking forever.
Buffett stopped investing in cigar butts because his portfolio got too big and the risk/return ratio wasn't always great. His big change was leaving Graham's philosophies for Mungers, and focusing on getting great businesses at a fair price rather than fair businesses at a great price.
https://www.oldschoolvalue.com/stock-screener/net-asset-curr...
To go further, this is what Warren Buffett made his first few millions off of what is considered "cigar butt" investing. These are stocks trading below their Net Current Asset Value (NCAV). That means take all of their cash, real estate, equipment... those are your net current assets. Now take a subset of those stocks, and you find some at such steep discounts that they are trading below the cash they are holding. How is that possibly rational?
To put that in perspective with a contrived example would be Apple, currently trading at $153 with a market cap of nearly $800B, $250B of that is in cash. Now imagine Apple is trading at $45 a share. That would value Apple at $235B...but if they liquidated the company, they would have more than that in the cash alone! And that is exactly the kinds of companies that folks like Ben Graham and Warren Buffett invested in, because they were so cheap, and probably not even great businesses, but had "one less puff" (hence cigar butt) in them before they closed up shop, were acquired, etc.
Now, one retort might be that these guys were investing in two of the worst markets in the history of the US economy - Ben Graham came out of the Great Depression and Warren Buffett from the bear market of 61-62. But there are still examples of this today. Seth Klarman's fund (which still exists today) has only had 3 down years and is considered to be one of the greatest investors since Buffett. These investments still exist, and it's all based on buying cheap when the market has irrationally priced them at a sale.