Knowledge is everything. I made a lot of mistakes in the beginning, but I won't make them again. So I think starting from scratch is easy. The day I quit I thought WTF, and took the time to pass some knowledge to a noob (with allmost no money to invest). He made $1000 his first month. I think that ain't that bad.
BTW I still have one site for sale:
http://www.gofuckyourself.com/showthread.php?t=461281 