In the best case, you get to change the world and make a bunch of money. Sometimes, you just have a viable business selling sugar water. And other times, you're doing something really good that's just not going to get you paid.

There's nothing wrong with the last thing, other than its potential lack of sustainability.

I'm now a teacher; I could easily make 10x my comp elsewhere; possibly 100x. Measured on your scale, the only value is what I'm getting paid. But it turns out that those good feelings are worth something to me.