I didn't put down all the ideas, and in fact one of them I'm working on in a different form! (I'm not putting too much stock in it though; it's more to scratch my own itch than anything else.)

I made a broad and sweeping generalization that they're not especially high quality ideas. I honestly don't believe the market is really there for a lot of them, nor that they can be turned into decent businesses even if there is a market due to monetization issues. (Yes, I know, actually charging people's credit cards isn't as appealing as a sexy exit strategy.)

In any event, shouldn't we draw lessons wherever we can, regardless of the situation? After all, I'd rather look at a list like this and have it reinforce the tenets of a good business model. It's easy to get caught up in the "what-can-I-do-to-make-money" trap, rather than create something that delivers massive value to people with credit cards and painful problems.