Nope, I doubt that Disney would bother having someone bid on their stuff. Disney does not need the money they make in the auction:
In 2002, I had been talking to Disney directly about buying something from them. We agreed on a price, and then it took them 10 MONTHS to tell me they could not sell it outside of ebay.
So they put it up on ebay for 33% less than we had agreed on. I bid and won it for the opening bid. They could have easily bid me up since they KNEW I was willing to pay at least 50% more of their opening bid (the price we had agreed on). They did not. (they could actually have made twice of what they put it up for! )
I think Disney screwed up when they gave that guy a positive feedback. He also bougth several other props that went up for auction again. He also got feedback for those. BUT he had bought some stuff from Disney BEFORE those auctions, which he NEVER got feedback for.