Well, following that logic the majority of gay porn sites that offer streaming or downloadable video would not offer any photos.

I believe several sites like CockyBoyz and Blake Mason offer mostly video screen grabs. But the majority of sites like Randy Blue, Sean Cody, Next Door Male (and on and on) offer hi-res photos along with the videos. I know those are not webcam services but marketing is marketing and I don't see how offering photos would hurt the VS business model.