I see that too on my Nexus 7, and I don't have multiple users set up either. Maybe someone with more expertise can weigh in, but I'm guessing that the files aren't truly duplicated, and aren't taking up twice the space. The fact that the folder is labeled "emulated" suggests that it's more of a virtual folder system for the multiple profile feature. I wouldn't delete anything.
Sent from my Nexus 7 using Android Central Forums