Seth Godin has a list of questions to help you evaluate your startup idea.
– How will you get new paying customers? – Why will your paying customers tell their friends and colleagues? – Will this business work at a scale that you can both achieve and are happy living with? – Is it easy to start? – If it is, what will keep others from starting it? – How do you avoid a race to the bottom where you’re trapped making a cheap commodity as a middleperson? – Will it get easier as you go? Why? – What incentive do customers have to stick with you instead of switching to a cheaper or more convenient choice?