Good for you Kai.
My remarks on not bidding when listed elsewhere are just personal and not aimed personally at you.

Small son and myself run the free advert site at www.homeworkshop.org.uk one of the things we put up front there is we will not accept any advert with links to Ebay or other sites.

I don't think it's fair turning it into a Dutch auction or free for all. If we do spot something on Ebay that's also advertised we just pull they guys advert and flag him for future adverts.
Two strikes and he's banned.

Our site - our rules.