You used a bad example, or you change the story when a legitimate point is made. Not my problem. Carry on.It was an example but my last experience had no trade values listed. Only had a set price with the option of accepting of trades. I made a legitimate offer and would have gone up $50 on the cash offered.
Another thing I don't necessarily agree with is the concept of "trade value". If I'm selling a rifle, for say $800, and you have a nice 9mm sig valued at $500, and you offer me the sig and $300 cash, I'm going to take that deal most every time. I'm not going to go back to you and tell you your sig only has a "trade value" of $400 so I want $100 more in cash. I generally ignore post that use that ideology.