When I am deep in tourney and I have chips, I def. will fold in spots post flop if it could take 20% of chips or more when I have little invested in the pot to begin with. The win could help grow your stack, but the loss then going through a few rounds of antes and blinds could leave you in a tougher spot if your face another situation like that. Basically I am saying once I am deep with chips I remind myself " it's just a hand, find a more favorable spot later " I try not to get ' married ' to a hand.