It would be a terrible mistake to pay for membership fee's at afternic.
1. Everyone (who has any sense) is not renewing their membership.. including myself.
2. You have to compete against BuyDomains names to get found for sales.
Please look at the screenshot that I identified the BuyDomain names to show how afternic does favortism towards BuyDomains.
http://warehousedomains.com/afternic-screenshot.jpg
now I did a search on afternic for the keyword "domain" and what suprises me is stupid names like ahdomains.com shows up higher than the name CheapDomains.com. It does not get any clearer than this.
3. If you want to sell your names, then put a "for sale banner" on the parked page. That is the easiers way to sell your domain. I have sold many names by doing this method and this gives me direct communication with the buyer without any escrow interferance. When you agree on the price then you can decide what form of escrow and I have had the best success with Escrow.com and I have been splitting the escrow fees with the buyer.