In a peer to peer network where people are selling things, it seems to be somewhat of a benefit to allow some sellers to have their IP exposed as opposed to hiding it. (In other words when the option to hide an IP address is added default setting could still be to show the IP address. Even though IP address changes (by broadband connection) I’d feel more comfortable knowing there was some kind of a trail (again depending entirely on the transaction) simply because you aren’t dealing with a company in the legacy sense. Noting that sellers are always able to know who they are dealing with unless the end user goes to the trouble of hiding that IP (which is not that typical). I have found that info to be helpful in preventing fraud.