For a while, until they get sick of it and loosen the hell up to go after you some. Most tables you want the pot warmed up so that there's something to fight over. Also if you raise pre-flop, you chase out a lot of crap hands but usually keep in hands with high cards - so if you flop a set and they flop top pair, that's a recipe for taking a lot of their chips. The pot's already big and they're ready for aggression.