Often a player asks the community "What's the price of X?" or "What does X
usually go for?"  Although there may be a history of a certain piece of
equipment selling for a certain price, the hard and fast rule of an open
market is:  An item's price is whatever someone is willing to pay for it. 
High powered items are only worth what you can get someone to pay for them
 "junk eq" is expensive if someone pays a high amount for it.  Don't expect
prices to stay constant, and don't complain if you don't like them.