I got the FW for my wife from shopgoodwill.com for around $280.00 and that included shipping. This was a less than mint machine, but in good cosmetic and mechanical condition with a good case, lots of bobbins, accessories, the manual and other goodies.
The bidder bidding on all the FWs on eBay is probably a dealer with deep pockets. Or if he's bidding on the same sellers adds he could be a shill. Bidding just to raise the prices up. I wouldn't bid on those auctions.
There were millions of FWs made from the 1930s to the 1960s. Most of the prices are way too high for what you are getting.
JMHO
Joe