Didnt they put all the diadem mats on the red scrip vendor(gathering, level 58 if i remember right - possibly only from Idyll)? If i were designing such a system, youd have allowances(likely 3 or 6). The person placing the order on the board would be probly be anonymous(maybe show once you accept?), they specify the exact item and put their money down(including listing fee). If no one grabs the commission within a week they can take the money back or extend the listing for another week for free. Picking up a commission off the board would lock one of your allowances(submitting the item would release it), and you would put down a fee as well. Youd be allowed to release the commission if you realize that you wont be able to deliver(with a safeguard that you cant pick it back up to prevent using this as a grief tactic). You would certainly need a time limit - my gut says 24 hours, but you might be right about 48. You could do a lockout as punishment for accepting and not delivering, or you could have the commission expire(and relist - possibly with the relisting fee coming out of what you put down when you took the commission) without returning your allowance. Repeat offenders would ban themselves one failed delivery at a time. Once you submit the item, it appears in the mailbox of the person who placed the commission(or maybe they get a message that their retainer has it?).