All I know is that I had a hard time selling FG on here maybe two years ago. It ended up selling for 4K plus shipping - LEDs, customer shooter and lighted topper.
POTC always seem to be $4,500+. I would say based on my FG experience and POTC observations that this deal should be FG plus cash for POTC.
Based on how you wrote it though it sounds like the trade was your idea. Things (FG) always cost more when you want them. Kind of frustrating how that works. You may have to give an incentive in the form of $ value to get the FG.
"Why do things cost things?"
- Homer J. Simpson