Ive never been hacked - but is that because i know a GM? Errrm no probably not - its because i dont share my account, my password is alphanumberic and my username isnt morax.
Admitedly if i got hacked i would have no trouble getting my equipment back because id kick up a big fuss - but thats irrelevent to your original post.... - level 70s dont get special treatment just because they are 70. Sure high profile players often have access to a GM one way or another so they can be rollbacked, yes this is probably abusing power of those that know GMs to some extent.
Conclusion: If K2 had a customer support system that worked effectivly people wouldnt have to take matters into their own hands.