I still think that a limit of one per person with three sales a day 8 hours apart at a first come first serve basis would give everyone pretty much the same chance to get a key. This would also eliminate cheating because they will sell out before someone has time to go through placing several orders, and eliminate the luck factor. Some people like those socialist "do almost no work and get something for it" systems though so *shrug*.
Then again a system where people only get one key will probably promote more aftermarket sales. Those who "gotta have them all" and collect one of each will pay what ever they have to, to complete their set, and those who only have one or two keys will decide to sell for crazy prices because it will be impossible for them to get a decent collection. On second thought we are pretty much there already, CCs for almost everyone!