To answer the original title - it depends on the item, the price, 'known' seller history, and the ability to assess and distinguish an honest gun at a reasonable valuation from crap or fantasy prices. None of us are as dumb as all of us (buyers).
It comes down to who is more knowledgeable about the item being offered and how realistic people wish to be (buyers AND sellers).
Sometimes sellers make mistakes. Bummer.
Keep in mind - We really have no way of knowing what items on GI actually sell for.......or if they get sold, at all.
Some of the prices, games, and 'claims' would be comical if they didn't taint the buyer's pool with so much misinformation and uncertainty about a particular market. It's real easy.........if you don't like that market, don't play it.
Most sellers with fantasy prices are banking on 'the greater fool theory'. So, there IS a gun out there for everyone, based on their current knowledge of production details and history for an item of their particular fancy.
Self-respecting and discriminating collectors are 'on to' the blatantly ignorant or blatantly deceptive. It's not hard to distinguish the 2. Some of us are not as dumb as all of us.
Maybe the question should be: Do you let GI influence what you perceive as 'current market value' for items listed for sale? Answer: Some of us are not as dumb as all of us.