I would genuinely be interested to know what legitimate uses server administrators have for kill/teleport commands.
I can see a possible use for the teleport if someone gets stuck in a map glitch and you want to “rescue� him or her without killing them.
I can also see the satisfaction of getting your own back on cheats with commands like this, however it isn’t going to last long because the cheat will just quit (and then probably log on as a different name). In other words this command really doesn’t give you anything you don’t have with the ban command.