Great Domains and Afternic have both realized a model that was created when domain were selling for outrageous prices will not work now. It appears to me that neither one will be going away completely, but will be phased into the new Verisign backed WLS (Wait List Service).
As I read it, they are deleting a huge store of names that are not moving, because most are priced too high, and nobody is there searching for them. Afternic has done similar by deleting any domain without activity within 30 days. With the millions of domains dropped in the last 18 months, their databases were both useless. Poor quality names just take space and resources with no income, and make it hard to find good ones.
It appears verisign has maybe found a way to get money instead of giving free parking pages. I would image they are charging for putting a fixed price for sale page for those who pay the listing fee.
My guess is a person will enter a name they want to register. If available they get a reg fee. If not, it offers them a name listed for sale if the person paid their parking fee. If bought, they'll take a commission. If not listed for sale, they will offer to sell you a WLS on the domain for when and if it ever drops. If taken, then they will try to suggest another name that is available or for sale. For them it's probably good, as they almost don't take no for an answer and offer you many options to buy. For the reseller, it's just another way to get a listing fee regardless if you sell. Actually, this is how ebay stays in business, by getting at least some small amount for everything listed whether it sells or not.
Looks like we are in for some big changes in business models.