Yeah, you are asking a bit too much money for a used device. A brand new XBox 360, Kinetics and a free game is $290.http://www.walmart.com/ip/Xbox-360-Kinect-Family-Fun-Bundle-30-Value/21978462
Sure you have a bunch of games, but it seems Skyrim is the most recent game you have. The 2nd controller does add some value though.
Yeah, I gotta agree that $200 - $250 seems to be a better value for a used Xbox 360 bundle. The next generation Xbox is coming out relatively soon so people could just be holding off for that.