Any drug seller that is directly taking MP should definitely avoid this practice. This is an easy way to link a real identity to a drug transaction.While it might seem good from a buyer perspective (and is on buyer side), sellers doing this do as MASSIVELY at their own risk. I wouldn't do it in a million years.Trading virtual currencies in and of itself isn't illegal, which is why MP-BTC vendors can do as much as they want. But trading substance with a MP is dangerous - all it takes is one on-location cash-in with a camera and you are cooked.