If film consumption continues to plummet, these low prices aren't going to be silly anymore.
I'm a great example. I shoot a lot of film, but I already have most of the film gear that I need. If someone dangled, say, a nice Nikon in front of me, it would have to be very cheap to be worth purchasing. I already have an F90 and an F90x that I rarely use... so these cameras are nearly valueless to me.