I know the seller. He is an ok guy and I have purchased some stuff from him previously. He does make sure the bikes are clean, functioning & safe but does not ride himself or really know much about vintage bikes based on our conversations. I think I recently stumbled on to his supplier for what he sells as well.
That said, his prices are moroninc in my opinion. These bikes are not worth what he is charging but if he can get it, who's to say he is wrong? Also based on my experience, he sets the price way high so he can be "haggled" down to a more reasonable price and the buyer leaves happy. My rough guess is that he more than doubles his outlay on most of the bikes he sells.