I remember when you bought your car.
Looks like you never really got much into driving it?
Reminds me of this thread
http://forums.pelicanparts.com/porsche-911-technical-forum/898302-has-your-911-become-garage-trophy-you-never-drive.html
Why involve a broker for a car that sells itself?
Are you worried about getting scammed?
Cash or a bank check solves that issue, right?