You know, I feel like this sometimes too. For me, however, I've just got to try some things. I've been doing it for 25 years and although I make a few hundred a month on my ideas, nothing has been a big enough hit to let me walk away from my day job. I suppose I either don't know how to find the "luck" or I don't stick with the same idea long enough. I do build a lot of things though. Some of them make a little money and some of them get amazing feedback that makes it all worth it.

Build something. It doesn't have to be perfect. Hell, it doesn't even have to be good. Just get it done. Try it once, maybe you'll be hooked.