With bitcoin it will be really hard to find a real person with a real purchase, much harder than if someone pays with a creditcard. Everybody should know by now bitcoin is not completely private and all transactions can be linked back to you (for eternity!). Unless you go through the hassle to cover your tracks.
But I don't think this is more likely than paying by creditcard: the post can accidentally deliver my receipts to the neighbours, or family members or visitors can accidentally see it.