Ask HN: Looking for a startup stories on selling too soon

Hi,

I'm looking for a startup stories on people who sold their too soon and regretted it later.

I want to know the emotions that you felt when someone offered you a very big check and what caused you to take it vs to keep on going on? What emotions goes through you head during that time? What feelings do you feel? What traps did you trip? What made you realize it was a mistake? Was there anything you learned now that you could have told you past self to stop it?