The seller knows his price is crazy. But he's hoping/betting on that one rich, crazy buyer that might bite on something like this. If it doesn't sell, (which the odds are low) he doesn't care, he'll just keep it and ride it. A couple of months ago an early ATC 90 went for like $12K on ebay; I personally don't think those 1970-74 ATCs are worth anywhere near that (meaning I wouldn't pay that); but someone else thought quite differently....
My Trikes:
1983 Honda 185s
1986 Honda 250es Big Red
1985 Yamaha 225 DX
1984 Yamaha 200EL "Yamahauler"