Same lesson can apply to most mobile apps now that all the ones that matter have already been made.

Indie development is somewhere between a crapshoot and a sucker's market. The costs are too high and the rewards are at best uncertain and at worst paltry to nonexistent.

I think it's a good time to point out that the most successful people during the California Gold Rush weren't prospectors - they were the ones who sold food, lodgings, supplies, and other needs to the prospectors, who worked their asses off just to make ends meet.