I guess one thing that I’ve learned for myself is that I don’t wanna work with folks who do something because they wanna get rich. If they make their decisions in life based on what markets are going to be the most profitable or what’s popular, it’s just not for me.
It’s more important to do something for the love of what you’re doing. It’s about having a love for the product and a love for users.
Instead of waking up in the middle of the night thinking about what will make you more money, wake up in the middle of the night thinking about how you can better serve your users. If you think of service first, the money will follow.
As I said before, don’t worry about your business model. Worry first about your pleasure model.
If you think about it, the greatest companies didn’t worry about making money at first. Google didn’t know how they were going to monetize search when they started but look at them now.
Oatmeal Stout - Justin Thorp's blog 
100% agree. If you find yourself building a product, and letting ad units dictate the design, functionality and overall experience, you might as well pack up and go home. You aren’t going to be a player in the market.
Build something that solves a problem, not something that creates many.
i’m 100% in love with the game, 100% in agreement that you need to do something useful for people before you try to wring $ from them, in favor of good risk taking. but you do really have to have a plan for making money, or you probably won’t. google not withstanding.
You are correct, build it for yourself or a small group of people and the masses will come later.
Now a days the most expensive part of building web application etc. is your and other peoples time, not the equipment.