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These are all good opinions. It clears up some of the issues.
It sounds sort of like going to a car dealer and trying to trade something in. You know what I mean. The dealer always tells you your trade in is worthless and they will take it "off of your hands" for half of what it is worth and be doing you a huge favor. Then the next day they give it a bath and put it back out on their lot and ask double for it. Then when you try and buy it, it is all of the sudden the most valuable thing on the planet.
When I trade with people, I decide what each item is worth as a cash value and trade from there. If it is close to the same value and it is something I want, I trade with this person. I don't try and squeeze extra cash out of them.
I agree with the other post about when I see "Trade Value is Higher" I don't even bother with this person.