Why not use DEC as credits for bids and rentals?
DECs are transferable like steem(*1) or hive. There can be "normal" DEC in game usable for normal purchases plus "custodial" DEC that is simply transferred to peakmonsters and works like credits for bids, rentals and/or credit purchases. Do I miss something important here?
*1: well for most people and for now, dunno what will Justin do in future, but that's not point of this reply.