Why won't they ban exploiters and abusers in this game?

I love the game, but that's a thing that always bugged me.

The developers are from Korea, where they put a lot of pressure on accusations, cheating, bullying. It's one of the few games where they publicly shame banned people by notifying the reporter.

But on the other hand, they have previously lifted permanent bans for exploiters. There were couple duping episodes, when they had to rollback the server (so the exploiters were literally damaging the developers directly), yet they have not permanently banned the people doing that.

Currently, there is a situation going on with the Grimsmile Rings, so you can exploit the game and craft them when it shouldn't be possible to do so. It can literally break the economy for a whole season.

My point is - what stops IM from banning the crafters?. We are at a risk of a rollback. It costs resources, it costs time, and it costs the player base. It's been going on for at least 48 hours. I cannot comprehend why the people who damage the game are not yet excluded from the community.

I'm here to hear your thoughts.