because if he DOES ban him, there is a 100% chance he won't pay.
There is currently SOME chance he does pay.
Chop already messed this up, BAS banning him will be the coup der gra
nope, you pay, you get unbanned and you say fuck you to all therx fellows giving you shit.
allowing him to post in the hopes he pays is not sending the right message.....you take away his posting then that is more incentive and deters the next scammer (not by much, but it is something)