Another thought on a "feedback/review" section.
How about a dedicated section in the Trades/Sales section with every registered member listed, sort of like a Sticky.
Instead of a dozen different members creating a "review" for "member X" there could simply be a list of every member with all of their respective reviews listed in one location.
Kinda like the registered users list (that could be searched and/or linked to their profile page for easy access).
I've seen several other sites that have 20 different review threads for member X and it's so disorganized & difficult to navigate that I'm sure most people don't even bother.
Seems like it would be easier to have a central location for all member reviews where any registered member could search for someone.
A lot of us have already had dealings with each other, but it might be useful in the future.
A format guideline could be used to keep things simple like:
Member X was the (buyer/seller)
How was your experience with Member X (positive/neutral/negative)
Do you think you will deal with Member X again (yes/maybe/no)
Comments: blah, blah, blah
Just a basic "I dealt with Member X and it was positive" type of review should suffice.
I'm just spitballing ideas here unsure: