Thank you for your input and your ideas. All are welcome - regardless of how long or how many YDC's you've taken part in - We're all YDC'ers and thats the important bit.
As the rules stand currently - the winner is the person who lists the item that raises the most money. To explain it in its simplest form - if I listed a book which sold for £4 and you listed a bag which sold for £5 - you would be the winner and be able to pick the charity for the next YDC.
You do raise some interesting points and have in a way built on Sarahs idea of putting names into a hat - which is an idea that I do like as it will increase the surprise and fun elements of the YDC and keep everyone in suspenders right up until the winners post is announced. Not sure how it can be administered though at my end - yes, it would be easy enough to have everyones name on little tickets - and will need to make sure that I don't miss anyone out - but in a way to keep the time taken to check to make sure that everyone taking part would be quite time consuming - whether we go to include bidders, winning buyers, and sellers or just winning buyers and sellers and not include bidders. Perhaps a thread where every one puts their name alongside a number and I pull a number out of a hat each YDC totally at random. That way if you're not in the thread, you don't get included. On the plus side it would cut down on the admin of it for me, but on the downside - who wants to go chasing around to make sure that they've put their name by a number to be included in a draw after either placing a listing, winning an item or placing a bid. This one will need some serious thought on the best way it can be sorted keeping time consumption to a minimum - although - to my mind I do like the idea as if it is worked right would be fun.