While I'm sure this is true, it really depends on whether it's your business, how much of the product is 'yours', etc. Most people however work for a salary and don't feel like hours invested equals return on investment. The latter is one of the main causes of burn-out; forcing yourself to spend hours and energy on something that does not have good return on investment. Setbacks weigh more heavily.

I think that in a few years your opinion may change again. Until then, I hope you're getting good ROI, and I'll admit that I'm a bit jealous as well.