You're not necessarily just raising in order to get people to fold. You're getting more money into the pot with what is most likely the best hand, which will make you money in the long run. Whether you want people to fold or not depends on a lot of factors. In small stakes limit, if you raise in late position, almost anyone who's already limped in is going to call the raise anyway. That doesn't you mean you shouldn't "raise for value", though.