re: Poker & 10nl - Cbet bluff- when is it not profitable ?
You can c-bet bluff good boards out of position. If you do not, you are essentially giving up every time you miss and are oop. That is very exploitable and easy to spot. You can also bet bad flops in position against one player IF you intend to fire a good sized turn bet, AND your opponent seems reasonably capable of folding weak hands. (Playing the turn aggressively makes c-betting the flop more effective) It helps to have something - anything; straight draw, flush draw, over cards, a small pair, just some sort of equity so you can feel comfortable pushing out more chips.
As far as what stops me - more than two opponents, calling stations and players who raise the flop a lot.