When SDL was my home a couple years ago, the scuttlebutt was that it was a million dollars to join (I dont remember it being a yearly deal), but part of the membership privelages included getting to use any of the members jets when you wanted. Likewise, any of the members could use your jet as well. With of course the owner having priority over his own airplane.
Also, when if you wanted out of the club, you couldn't leave until you had sold your membership slot to someone else. Believe there are only 10 members at a time allowed.
And yes, the car collection is said to be something unbeliavable!