YC stresses the importance of company founders having a positive working relationship, and in his INC magazine interview, Paul Graham himself spoke on his previous dealings with YC startups where company founders fueded and didnt get along. He spoke about how that alone can derail a company, and how it is a basic pain in his neck.

On the YC application it states, "How long have the founders known one another and how did you meet? Have any of the founders not met in person?" This is not done by accident. So how in the world are you going to host, critique, and try to provide opportunities for new startups to get noticed and succeed, if you cant even get along yourself? This is ridiculous. Lead by example.

Maybe th TechCrunch50 founders need to read that INC magazine article.