(On a bit of a tangent here:) The primary win of BitPay (and bitcoins in general) seems to the elimination of chargebacks. This is good for merchants, but not-so-great for customers.

It especially isn't suitable for an environment like eBay where you could potentially have less than trusthworthy sellers. In such a situation it is necessary and beneficial to have some sort of middleman (could even be the government), that you could go to, in case whatever you "bought" wasn't what the seller represented it to be (or really any other such issue).