I don't think there will be a purchase exploit in the market.
I do however predict much QQ and breaking of teeth on teeth over server queues.
The goldilocks syndrome, MMO style: WAH! there's not enough players!.... WAH! theres queues!.... rinse and repeat because an MMO server can never have exactly the right amount of players (ie: one player less then what triggers a queue and all players standing by to be at the beck and call of goldielocks for insta-grouping, and the players must not compete with goldielocks for in game poridge either).