Since you shared this post with me, I should mention that bithalo blackhalo and bitbay all have a decentralized market. Ive used the bithalo one before and worked pretty damn well! Its a shame more people don't use it. It actually has a really clever two party escrow system. So the escrow is decentralized too, which is probably better than arbiters on OB who probably have no way of knowing who is telling the truth.