A lot of those aren't quite like this one, though. The author did some smart things:

* app received press before quitting job

* app started making revenue before quitting job

* author had time to watch the app's trajectory before quitting job

* author diversifies and helps other people make successful apps, across a variety of categories, rather than betting it all on games.

The point of reading success and failure stories is to contrast them as well as feel inspiration or schaudenfreude as indicated.