At least I think it's a mistake ... I don't think Tobey Maguire has even agreed to do a 4th installment. I'm pretty sure there isn't even a script or casting yet.
[UPDATE] Apparently it is a charity auction for a "Spiderman 4 Experience"
I take great exception to this (even if for a charity) - I am not allowed to sell anything that cannot be delivered / completed within 30 days according to the eBay rules regarding "presale auctions".
eBay permits Pre-sale listings only on a limited basis. The seller must guarantee that the item will be available for shipping within 30 days from the date of purchase (i.e., the day the listing ends or the date the item is purchased from a store front listing). The seller must also clearly indicate within the listing the fact that the item is a pre-sale item with a delivery date that indicates the item will be shipped by the 30th day from the end date of the listing. Additionally, this text must be no less than the default font size of the eBay Sell-Your-Item form. Currently, the default font size is HTML font size 3.
eBay, at its discretion, for special promotional events, may approve an actual manufacturer of an item (like the game publisher in the examples above) to sell an item outside of the 30-day pre-sale guideline as long as the actual manufacturer is supplying the actual item for sale. These exceptions will be made for certain promotions and must be approved prior to listing items for sale on eBay that fit the exception above.
It is not even certain if there will be a Spiderman 4, it's not certain if filming will begin within a year, it's not certain if it will have to be a reboot or recast because of current actors unwilling to participate based on a script. The biggest exception is - the prize cannot be delivered for at least one year - possibly more. If shooting began now - the movie couldn't come out until summer 2010.
It's not fair that eBay is making these deals with "big causes & big companies" that are extreme exceptions to their policies.