Rumor is plunderer can only see those 15 levels below them. So the truly low level wont even need any *. On my server, top 50 have one 77, one 78 and rest are at least 79, so anyone 61 and below are completely safe from plunder.... Of course, I can't possibly know if this is true.
In any case, as a 41k power ftp that's ranked 7th in power in my server, one that is somewhat active at least, I rather doubt that I won't make top 50 in any server except maybe the first in each region. So I doubt p2p is the only way to plunder. Granted I don't plunder on principle but that's a whole other matter.