Tractor Blue book says a 5085E w/ cab MSRP was just over 50K. Not sure circumstances of how you paid 57K. Not many people will pay over MSRP for used with no warranty. Not many people want to pay MSRP period. Everyone wants a deal at less than MSRP.
Tractorhouse has several dealers trying to sell used 5085E cab models. Asking prices are in the 43-46K range. Perhaps the offers you are getting are from dealers who need to buy low to make a profit on the resale.
57k out door with taxes and a few k in options. It was like 52k with h240 loader.