well, domain market is overpriced now days. its hard to find any good domain with 3 letters for cheap now.
i recommend to use any "expired domains" serivice to find domains you need.
It's more of supply and demand pricing rather than overpricing. Take a look around and see how many you find for sale for one and then see how much they cost. Even the expired names will cost you a nice chunk at the drops. Just like anything you might collect the fewer there are and the less you see around for sale the more the price goes up.