1) I hate hacks because you will ba na admin on a server without access to the console and the hacks will ban you for ever
2) The hackers are often greifers
3) They will give them self world edit to greif your entire server
4) The people that use them are often bad people
5) They will kill noobs that could be long time players
6) All server hacks are used to be a pain in someones ass