Scammers will never end. The staff on rune-server doesn't get paid for their job too.
The thing is, it's not just rune-server, its every community. No matter how much you try, scammers always come up one way or the other. However, my experience with getting scammers banned on rune-server was actually good. I got a few banned pretty easily. So not sure if the mods have given up or you aren't providing sufficient crystal proof.
But at the end of the day, you are all by yourself.