Fair amount of greed but also not many coming around for sale.
Something is only worth what someone else is willing to pay for it and currently, people are accepting the high prices.
I had this discussion with a local camera shop this past weekend when an M6 arrived as trade it. £1500-1700 was the intended resale price but a year ago it was £1000-£1500.
The market will only accept so much price increase before they start falling again so I'm holding out a little longer. There were plenty of M6 cameras made. They're all out there somewhere. :-)
Canon EOS30, Contax G2, Zorki 4, Zorki 4K, Bessa R2a, Lomo LC-A, Olympus XZ-1, Olympus OM2-SP, Olympus E-510, Sony RX100, Fujifilm X-Pro 1 and X-Pro 2