Write the apps you want to write in your free time and out of love for the platform and for those specific apps. Take risks. Make those apps interesting and different. Don’t play it safe. If you’re not expecting money, you have nothing to lose.
Brent’s post reads a little bleak, but the upside is that there is actually a huge upside if the app is good (and gains market traction, which is part of the “good” I am talking about) — and I mean monetarily. Don’t spend a year working on it — get something solid out there and send me an email. I actually love talking about good apps.