You can't just report someone cuz you can. must have any proof or something or mods will ignore it (also make the report process snarl-up, taking the REAL ones more time than needed, so don't even try)
Still think is a good idea, tons of vanities and mons would be wasted in a banned account, i mean, why not? certain vanities can't found cuz nobody wants to sell i.e: kyu hat (Someday will afford one ;-;)
but should be controlled, things as vanities bought by a credit card refund/fake card should not be at auction.