they do it to see your reaction to the troll.
some times they will ban you
4 no reason.

i was disapointed.i once Raided an admin then he came to his base and said
"Nobody Can Greif an ADMIN"(he did say that).
luckly i got a hack to get me unbanned.
when i got on i didnt get too much revenge.
i set a tnt trap an blew up his stuff and banned him 4 6 months
for abusing his powers.he was also stripped from his admin rank.

if your an admin abuser plz stop.

yes,they do ban you sometimes to do it
4 the fun of it.

if you were banned from a server 4 no reason.
make yourself a server.but dont abuse the powers. ;)