It's also worth pointing out that the guy's plan of action was pretty stupid. If the suppliers had paid the slightest bit of attention, maybe even talked to each other a bit, they would have found out what he was doing, and refused his request. The long term good history of the business wouldn't count for anything if it became known that the owner was up to his eyeballs in high interest debt and had just sold off all his stock. I mean seriously, his plan hinged on the suppliers not noticing that all his stores were empty.
The story probably isn't true, but if it is, then it isn't something to aspire to. It's a story about a guy doing something very unethical (if not fraudulent). It's a story about a guy taking massive risks with other people's money in order to benefit only himself.
If your idea of competitive advantage is doing something that only helps you and harms others, then you shouldn't evangelise about it. For one thing, it can only hurt you in the long run if other people pick up your ideas and act this way.
I don't disagree with your reasoning, but I think your result is completely off the bat. The thing is sometimes you have to take big risks to get big rewards, and if you play it with enough of an edge you can win. Whether or not you think it is unethical or not right, in reality I think this is how a lot of businesses are actually run.
Sure, these kind of things may be considered unethical and if a new guy came into my industry and rose to the top very quickly by exploiting a loophole after i've devoted years of my life to do it the right way, i'd be properly pissed off. But this option can act as a springboard into turning your ambition into real success.
I once heard a story, no idea if its true or not, of a guy that bought a chain of retail sports stores. He didnt have any real money, but managed to structure the deal to pay a small deposit and pay the remainder over time. What he did to raise the initial deposit was get a series of personal loans, house, friends and family, etc. He then bought the business by paying the deposit, then immediately sold off all existing stock as quickly as he could in sales and wholesale lots, giving the business a massive cash injection and revenue spike. That allowed him to pay off all his personal loans and pay the remainder of the money to the seller. He then got long term lines of credit from suppliers based on the long term good history the business already had, restocked and resumed normal operation, over time paying down the lines of credit and keeping the business on the good track it was already on.
My point being, is that you should always look for your competitive advantage.