I've been staying out of this, but here's my take on this... I really don't want TMN to turn into an auction site. Especially with the potential for bum sellers/buyers/products... etc... and chances are TMN gets the blame and is required to fix it. If someone doesn't come through on an ebay auction, who do you complain to try to get your money back? ebay. I don't think we want to have to deal with this.
Although there could be some positive effects from something like that, I don't think it's worth it.