Insider or Outsider? To be or not to be,...?

Like extended warranties and a "prime" membership for fast shipping, these offers create a revenue stream in exchange for services a company is already providing.  If such a membership included sneak previews of new ads or discounts on sales commissions......
Because of bad shipping experiences, I could see how a door-to-door courier service could open up the flow of used gear on the marketplace---may be worth the cost, split between buyer and seller.  

How about making a troll-averse section. That would be worth it... if the trolls were kept out that is. 

A Troll Toll? : )

“Build it and they will come.” 

Bidding wars. Pay to keep out someone. but then they can OUTBID YOU to post. HahAND the bidding payments and who is blocked, get LISTED next to the post.It would be such fun to just watch.