It's called "the free market". Couple of thoughts: - A free market only exists when both buyers and sellers have both choice and information. Amateur radio gear almost always fills both requirements, because in practically all cases the buyer doesn't have to buy any particular item, and the seller doesn't have to accept any particular price, and the information about selling prices and such is readily available. - There is no "law" which states what such items "should" sell for, nor what is a "fair" price. This is particularly true of used gear. Some folks think there is - that, say, a 10 year old radio "should" sell for, say, 75% of the new price - but they're flat-out wrong. - In pricing, it's important to compare apples to apples. Many rigs were made in various versions over the production life, and with all sorts of options that can dramatically affect the price. (And of course condition, warranty, etc.) For example, someone might ask "what's the fair price for an FT-1000?" First, which model - FT-1000, FT-1000D, FT-1000MP, FT-1000MP Mark V, FT-1000MP Mark V Field? (Those are just the ones I know). Second, what options? TCXO? Filters (Yaesu or Inrad?) Other options? Inrad filters for the FT-1000 family cost between $133 and $175 new - EACH. An FT-1000 family radio loaded with Inrads is a very different thing from one with just the stock Yaesu filters. Third, what about mods? There were some significant improvements to the FT-1000 family over its lifetime. Those details are important, and can explain big differences in pricing - and not just for FT-1000s. New rigs have the same considerations - often the low low prices seen on websites are for a base model with NO options, and when you add those options in....wow.