Posting this question on a UK forum probably won't yield any valid data, since pizza rolls are (to the best of my knowledge) an exclusively American product and not sold in the UK.
For arguments sake. I'm going to imagine they're liking eating those mini Kiev things that come out at Christmas time, they probably weigh about the same as the Pizza things, and are as equally unhealthy. I could eat around 7-9 of those, I think. Maybe more.
Never heard of them before but they don't seem that different to party food one can get here in the UK. They're baked until the filling will burn your mouth, yes ? I've never eaten any, but suspect I could down about half a dozen to go with the glass of wine. You sure you aren't just advertising ?