[MRBAA]

The general idea that you should raise big pairs even when they won't fold and you will end up losing more often than not is worth repeating. The reason is simple: pot equity. When you raise into a field of five other players, you are putting in about 16.5% of the money, but your big pair will win more often than that . But in stud, unlike he, there are more variables: what are the other people's up cards? (do they have an overcard to your big pair), how live are your pair cards and side cards? And how do people play -- this is often overlooked but really important in low limit games. If you will bascially give away your hand by raising with split kings, and players will be correct in calling a completion anyway once they've commited the bring in, you may sometimes want to wait until fifth to bet or raise -- it's very much a feel decision but it is not always wrong to do this.

In general though, as others have said, it's never a bad thing to get another bet in when you are a money favorite.