I spent literally 35 minutes writing my first iPhone app and it's brought in over $4k in sales over the last two years. That works out to ~7k/hour. Alternativ

I spent literally 35 minutes writing my first iPhone app and it's brought in over $4k in sales over the last two years. That works out to ~7k/hour. Alternatively, I've spent weeks or months on projects for zero revenue. The moral of the story is: there is only weak correlation (at best) between effort spent and revenue received. Entrepreneurs do not get paid by the hour.