I guess if you don't have to pay any fees until it is sold, you can list things with
ridiculous prices just for fun... or to sit at a high price for months to have other buyers and sellers think that it is the going price, and then every seller lists it at that price.
Otherwise, it could just be non-fans hearing about how "rare" equals "expensive" when it comes to vintage toys (or they saw it on one of those toy-collector TV shows), and guess a price without doing some basic research.