Back during the dotcom boom business jet manufacturers were doing the same thing. People were paying $50,000 (in 1980 dollars) to buy a place on the waiting line for a new Lear or Gulfstream.

The first place I tried to buy a Crossfire at (Feb. 2004) wanted $40,000 for a car that had 1500 miles on it. The buyer's wife had come back from Florida and found it in the garage and said "it goes or you go".