When to quit is something that each person should probably think about sooner versus later and my guess is that number is all over the board. Buying is WAY easier than the exiting plan, just sayin. I do find it comical all the big talk on the message board about not selling for "x" when I would bet my investment most would indeed sell for that price. At the end of the day do what's best for you but in the meantime lets all get in the black.