Will staff be invulnerable to this? I myself have been at 500-600 karma a lot fo times, due to me killing RDMers. I don't really think a ban or kick would be appropriate for a staff member that just get's unlucky like I do a lot of the time.

But you raise it, other players could also get as unlucky as I do a lot of the time, so if it got raised, we'd have to look out for everyone 3x as much.