I was about to set up an auction and was planning to give some of the earnings to charity but then i saw this:
"MissionFish UK vets charities, processes donations and advises charities on how to make the most of the eBay marketplace. MissionFish UK takes a small administrative fee from sellers donations to cover core processing costs."http://pages.ebay.co.uk/help/sell/eBayforCharity-fee-policy.html
Take a look at some of the examples.
Just found that MissionFish are a charity themselves....but still surely if you donate a % to charity you expect your whole donation to go to that charity?