Well I tend to agree with PG as I have participated in start-ups with friends and non friends (tech geniuses). Friendship can be achieved through fire, but if there are three founders and two grew up together guess who will be wrong most of the time, and guess who will look like they are missing out on the fun. How can you ask someone to leave something they created? Would you ask a captain to relinquish his command just because hes led the crew astray?