There are ways to addressing camping, however, the Karma system is not meant to address camping nor other game-play behaviour, but rather like DevHC mentioned, Karma is meant to address poor meta game behavior (such as griefing and other violations of game server rules).
The problem of camping in Tremulous is discussed in this topic: Is camping in Tremulous a problem?
They are two parts of the same primary purpose and carry equal weight in the design.
The maximum amount of karma you could earn each day would be capped.