Follow ebay's legal rules then (see rule 1)?
Get a new subforum.
(suggesting) RULES:
1. State clearly that you're buying a mail bubbler/box/[thing to mail] with free pins/goodies.
2. State clearly what each box would have (i.e. if all of them have LEs, some have LEs/WDI -whatever you decide the game prizes should be-, numbers don't really need to be given but all type of pins should be stated)
3. If a person pays, something must be given (i.e. each [thing to mail] has at least 1 Hidden Mickey/Rack/LE/PoDM)
4. 1 buy-in per user for the first 24 hours (to give people a chance to all play), then unlimited buy-ins. (MEGA SUGGESTION)
5. If the people randomize is involved with pre-fixed numbers then the prize numbers must be given to MODS (one for the new subforum?) prior to making game. (In order to make it fair and not give out big prizes to friends).
6. If there is an order of choosing, all prizes must be known so that everyone knows what they can win from being #1 to choose to #over9000 to choose their prize.
We don't know what else.
We're paying a game where we're kind of thinking we wont win a pin, but at least we get christmas stockings, so we get SOMETHING for our purchase. Either way games are fun and the chance (and hoping that you win the big item) is great.
P.S. Some people collect different things, so whatever type of pin (LE/HiddenMickey/Reveal&Conceal/Mystery) would have a different value to everyone...so if someone does a just hidden mickey game (and states so), then people can decide their own value for their buy-in and see if they're being overcharged, undercharged or paying just the right amount. For instance, most of you (and us too) would pay a good amount for a game with R/C *FAVORITE PRINCESS/Disney Girl* as the grand prize and that is considered (from our experiences) as a type of pin lesser than say a PoDM just because, in type only, PODM > mystery box pins.