I am evaluating my startup idea and the first question work well for me. There is a huge system around us constantly praising cool things, and its easy to get i

I am evaluating my startup idea and the first question work well for me. There is a huge system around us constantly praising cool things, and its easy to get in to a trap of building something that is cool. Personally, I stick with Color and AirBNB. Color (the original app) was the epitome of cool. They were building something different, were innovative but I found little value in their product. AirBNB (if you take away their immense success) is a generic idea which has done well thanks to fantastic execution. Color and AirBNB are on two extreme ends. I stick with Tim O' Reilly's work on stuff that matters call. The second question is 'the question'. Whether there is market or not, I will only know after my product is out in open. Your third question doesn't apply to someone who is in the evaluating idea stage. At this stage, you are leaving everything to jump in to your startup, so you obviously love it.