I check the Craigslist in our area every day, checking for sewing machines. One has been on there quite a while. It was a Singer treadle and started out at $400, then dropped to $350,$300, etc. to finally just make an offer. It either sold or they gave up because I haven't seen the listing in a while.
It amazes me that people think they will get mega-bucks for an old, worn out machine with cabinets in such sad shape. Maybe they see the small featherweights going for such high prices and think because it has a cabinet, it must be worth lots more.