self plunder still happen even with the 15 lv thing. Granted, a lot of them are being done with zombie accounts as opposed to self made alts but still, it happens. In fact, there are plenty of ppl who say it's a good thing since it's a victim-less crime (as opposed to actual plunder) and consider it a solution to the fact that servers are dying and Oasis are not merging them fast enough.

In other news, with X server, it is potentially possible for one to benefit one's main using *t on a different server using same account in arean and masuri(indeed, it is more difficult and unless the two are close somehow, might not be possible in arena), but I wonder if that would be against the rule because characters on different servers are expressively allowed...