Perhaps I should have added "and he can quit his day job" to the list.
I you've hit on the point, though. Obviously I have a lower set of criteria for what makes something a "success" than you do; I don't believe something needs to actually take the exponential curve up to VC heaven to be worth doing and a commercial success - whether or not the business model could, in fact, support that.
If I put up a random web page on a free hosting provider, slapped Adsense on there, and started making $1/month, it would also fit your definition.
You set the bar on "pretty well" way too low. This is also the problem with a lot of startups (and why they end up failing).