You are over simplifying getting orders through.
I know its difficult or they wouldn't offer it - I'm not trying to say something is fishy because "why don't they just order it themselves" -
let's take an example of an item without a commission to make things simple, they are resellers... it's much easier to get a bunch of people to buy for them vs spending hours getting creative with guest purchases etc.
I'm just trying to figure out is there any other not kosher or illegal dynamic that could get someone in trouble.
It seems the only issue is "household limit"....and not sure if its even a ethical issue to ignore that?
You could say technically once you buy it it's yours to deal with so even if you have in mind to buy as many as you want once you get it you can then 'decide' to resell even though BestBuy does not want that.
Further, most of these groups supply best buy tax id's that are given to the buying group people from best buy after they show bestbuy they are resellers so it seems they if they cared they would shut it down.....they should be able to tie 1,000's of ipad orders to a tax id they gave out.
^^^^^ I do not know Halacha this is just my ramble....am I trying to justify something unethical?