Well I've never used a 3rd Party hack or any such things to get in, I simply used the 'mount forces you under the barrier' trick. It still works for some.
And to be honest its not hurting anything by you being there, me and a friend and mine just wander around and comment on crap and then leave. It's a fully functional area if a bit barren that doesn't affect the gameplay of anyone in the server so why the hell would it be bannable. It's just one of those easter egg things.
If I was using said place on a PvP server to sit there out of sight of players and gank them from a far (presuming the map had a hole in which to do so) that would be something bannable.