If I did, I'd have already sold my Facebook and Twitter shares and sprinkle words of wisdom down upon the masses. Or become a VC.

But, if I'm a company looking for vendors, I evaluate "good" vs "bad" in the context of sustainability of the org. If they don't have a path to profitability and sustainability as a company, they're bad. If they do, they still may fail. But big companies fail too. I know no one gets fired for buying Oracle, but what are you missing if you ignore Postgres?