A buyer on here backed out on me a couple of weeks ago. I'd taken the bass off sale on here pending payment as well as on ebay (losing my final value deal), gumtree etc. It was frustrating, but in the grand scheme of things not the end of the world.
I've done many excellent deals on here and met some lovely people, but unfortunately have had more issues on here buying and selling than in any other marketplace. I did used to believe in the BC code of ethics as suggested above, but the forum is just a group of disparate people and as buyers and sellers we just need to protect ourselves as best we can.