No, I have never heard of this. There are many rates, such as interline rates, not available to the public and there are some amazing deals. What you see as a $3000 price may be $600 to them and cabins are sold last minute that way. Get a job with an airline or hotel, for example, and you will pay much less.
I don't think haggling in a market, or purchasing a car or house has anything to do with this question.