DSN ... give it a rest, dude.
Find another cause, please.
You seem to be fixated on proving me wrong.
You are going over the line.
This is only the internet and not real life.
Have a great day!
Your question about the difference between cash sale and trade value is a good one. I've seen the same kind of posting on Texas Gun Trader web site, and I always imagine some poor country boy sitting on a porch wittling on a stick trying to solve this riddle.
I remember distintively in my first lecture in economics class the professor talked about a barter economy (before money) where people spent a lot of time trying to determine relative value ie: two fish vs a loaf of bread. The conclusion is that there is no answer to relative value because it varies from individual to individual, their supply of a good and their demand for another good. If you introduce spoilage and portability factors it gets even more complicated. This is why money is used by every culture on the planet.
The bottom line is: forget the trade value listing and the only value that matters is cash value.