Russian way of thinking about business model is different: Nastya is creating some kind of excitement resulting in many clicks and viewers. Therefore successful.
As answer to my concerns about Nastya and cam7 combined with the question about coming up close of Sofia, there was following answer from VV:
"To our surprise, in Sofia very effektivka kommercheskomi plan. Therefore, we will not close it and re-form, while it lasts."
So, the only way is to stop watching Sofia.....