In a hand with 6 players, there is a very good chance you are already beat and well behind. Still, you should bet out here. See where the action takes you - if there is a slew of re-raises that follow, you can fold and feel like you made the correct decision. What's the point of a big pot when someone with Ax, even if that X is a rag, leaves you with 2 to 3 outs at best (assuming that someone doesn't have the Kspade). On the other hand, if everyone just calls, well, then maybe the pot is big enough to justify betting again on the turn as long as a spade or K doesn't come up. In other words, your flop bet should be a probe bet, something to feel things out, but you're eyes should be set on folding a hand if the betting gets hot. Just got to deal with QQ losing sometimes, that's all.