I would imagine danbeaver's comments are intended to be tongue-in-cheek. I've used Amibay numerous times, my "nationality" has never been an issue. In fact, due to this hobby I've met some quite friendly folks all over the world. The rules are simple enough, IMO.
The few disappointments I've encountered had nothing to do with the site, and are the same kinds of things you might deal with on ebay or anywhere else: The hardware is getting really old now - caveat emptor.