People are just in a "wait and see" mode to feel out how the new pricing is going to play out.
Some are already catching onto the fact that the 7xxx cards will never be even close to the $250 mark that the 6xxx cards were going for.
People who don't want to pay out the rear for a 7xxx card but still want to upgrade will see the value of used 6xxx series cards soon.
That's why AMD took them all off the market
I may just pull mine off the market and let the reality of the new pricing sink in, then sell it....