let me explain whats going on...
It is possible to fix this without rolling back... But It is very hard.
All GMs (aka SignPainter... alone) doesn't have much time to work on server (aka they dont enjoy it anymore).
Trying to fix it without a rollback may keep not-Legit players the way they are.
And it also may damage Legit players.
I experienced this kind of situation in the past, and its not something cool to fix. And It still wouldnt make everyone happy.
On the other hand, if they Rollback 2 weeks and give back double exp to everyone, would be easy, quick and make sure no abuser remains with the money. Also, 2 weeks are nothing comparing to the damage it brought to server.
In the end, you must understand: There is no way to make everyone Happy