Not necessarily related to P2P use The spread of this isn't necessarily related to high P2P or BT use. You are going to have many people who fall for this because they are gullible. They get the e-mail, and even if they don't use P2P, they think, "Why am I getting this? I'd better open it to see what it's about." They then open it and get infected.
I really wish we could see the results of a study to find out which Internet users are most likely to fall for these scams. Is their success rate age-related, education-related, or maybe a combination of several factors? I think that, until we find out, it's going to be hard to get these scams under control. There is a subset of user who is spreading them, and we need to identify that group.