Petitions have been done before and they never work. The ONLY thing that would work is if every single seller left and that ain't gonna happen. Gotta hit Ebay where they'll feel it, in the pocketbook. No sellers = no buyers = bye bye Ebay. Won't happen.
Although I do know many long time sellers who have pulled all their auctions & inventory and moved it over to places like Amazon, Ioffer, etc. But they'll probably be back...sigh..it's really sad
