I don't think it's all for the good of the server. It's not like there are only 1 or 2 admins, who don't get time to play, so hackers come to these servers to hack away.
We have plenty of admins and so I think the majority of hackers are caught pretty fast, if not by one, than by another.
When an innocent gets banned, It makes them message all of their friends and say "Lawl, I just got banned for hacking on this shitty ibis server, full of baddies"...
yup.,