I talked to the ebay seller (a dealer) who I bought mine from and he noted that Dish required them to buy the 522's. When they leased them out he received a rebate back for the purchase price. Apparently he said, a lot of dealers didn't realize that the 522's had a "shelf life" and that if they weren't activated by certain dates, Dish would no longer rebate back their purchase price. The guy I bought mine from was dumping his inventory to recoup his purchase since his units were no longer eligible for rebate.
Jack