How about this, since the major concern is transferring Flezz, why not set it so that any money in excess of whatever the current hidden “abuse” value gets lost in the system due to hackers or some other sort of spendfriend error? This way the auctions would still go through for those who are doing so for legit reasons, people can have absurd bidding wars and actually get something from it and the flezz transfer cheating is set to EXACTLY the same limits it is now.

Admittedly people could learn the exact amount they can possibly abuse the system by for transferring flezz to and from each other but they can do that right now anyways, just with a little bit more work.

“We are sorry, but error made in accounting for transfer. In accordance to records we give what correct Flezz probably. Spendfriend to be ashamed!”