My friend and I tried something similar. It was a site that started off blank, and then we'd only build some subset of features that users requested. It didn't

My friend and I tried something similar. It was a site that started off blank, and then we'd only build some subset of features that users requested. It didn't turn out so well. I learned that it is a lot easier to request a feature than to build it, so you get a lot more requests than features that you actually build, which gives people the sense that you aren't really doing anything. People would come and request a feature. If it didn't get built in a relatively short amount of time, they'd never come back and you'd be building a site for people who don't come to the site anymore. Also, as anyone in a customer facing role knows, people don't usually have a well formed idea as to the feature that they want or the problem that needs to be solved. But I wish them good luck!