Still more transactions cleared and not a single problem yet. Like rake says so far it's just a "what if". I am now adding delivery confirmation to my orders to so I have some ammo for SR mediation, and yes it is a good idea to build some kind of a margin to account for shrinkage. This is a fact of life, there are asshole chicken-shits everywhere, whether you are selling shoes, tools, or MDMA. Just accomodate for them.