Ebay - Charity Auction Link Building

I am sure I have seen some coverage of this before, but not much recently (although I have not been reading around as much as I used to).

Some people auction off stuff on eBay and share the profits with some non profit organizations. They contact non profit websites when they launch the auctions and try to get links to their auction and their website on the supporters pages.

Some of them start two auctions in parallel supporting different charities such that bidders aim to outbid the other item to show how much more important their charity is and how much more they support it.

After paying back the costs sometimes the links are way cheaper than buying similar links directly, and you help charities. Win win.