I based my reply on some notion that the selling of jerseys is done for the purpose of some charity as people have claimed. I'm not gonna guess how they or who ever shows this money as income and then try to guess where it gets dispersed. Theres room to play with the numbers if you take into account the cost to prep, advertise and sell these jerseys not to mention the initial cost of the jersey. Theres room to play with the numbers at tax time if the charity thing is what their doing. The whole charity thing is insignificant either way when you talk about possible shill bidding.
The bottom line is someone is getting paid to sell these jerseys and show a profit so how and who is doing this for the teams. If they're being paid a commission to move these items then no one would be surprised by possible shill bidding. Teams that have their own team store have thousands of people moving thru there on game day. If an item doesn't meet expectations at auction could they high bid it and later offer it to one of the store regulars at a set price then turning a profit??? I think its very possible.