I can't even begin to recall the number of times people have asked me to build an iOS app for them. The idea is always uninteresting or just a clone of something that already exists. The implementation would always take much longer than they would want it to take. The cost is always much higher than they expect. I always feel bad shooting people down, but it is just incredibly unlikely that the app will "take off" and make a boatload of cash. It's just not going to happen, so I don't waste my time on those types of requests or suggestions.