The Godfather
Just Business
I can remember when it was free or almost free to sell something on ebay and paypal would process your payment just for the interest they would earn. eBay is now part of the culture everyone knows about it. Beside if it actually looked like the alternative might gain traction they would probably be bought up by eBay. Google might be able to go up against them but I don't think they have an interest in it. You also have the people that say Facebook will move into the game as well. I do not have much faith either one will do it better/cheaper than eBay.