[Eric72]

As I understand it, whereas it pertains to auctions, the term "all proceeds" would typically mean the profit realized by the auctioneer.

Hypothetically, let's imagine the item sells for $1,200,000. Let's further imagine the BP is 20% and the consignor gets $1,000,000. In this particular example, "all proceeds" would equate to $200,000 minus any expenses incurred by the auction house.

So, the donation would be significant; however, it wouldn't be the entire hammer price.