One thing you will have to recognize is that this will happen over and over again. So you are not going to find 'The Product' because there will always be other products that you could make and chase. And new development is so much more fun than maintenance, the same goes for new companies.

In your shoes I would analyze myself first before making a decision: are you just good as a starter or are you able to go the distance? And then to recognize that most of the value creation happens early on in the life cycle of a company but most of the value capture happens later on. So if you exit early you will financially hurt yourself.