Malcolm, I feel for you and the guy is definitely a yutz. Needs a kick in the pants and a bag of flaming poop on his porch.
Now that I have that out of my system, in order for an invisble relationship like ours to work, we need to go on SOMETHING. So feedback, I think, is as good as any system we can get. Had you been a scammer, I would have wanted to know as your next potential victim.
When I had my retail gallery, I donated alot of my paintings to charity. I did it for the good of my health, but also because the charity always sent me a nice letter on their official letterhead. I framed each of these and I had this "wall of feedback" (if you will). This was as good a sales tool as any I had. Now it's true I did not post any that were negative, but I did not get any of those!
Of course folks don't think when leaving FB. But I had some non-thinking nutbars at retail too - and I had to deal with them IN PERSON ((((SHUDDER)))).
Your pal here *and over there*
Lisa