People who frequent services like these will go to great lengths to keep the fantasy alive. Heck believing that the model on the other side of the screen cares for you as a person needs a... special state of mind to begin with.
While you are right, I think the mindset is different. People know that the interactions are fake. The real lie they tell themselves is that "If they only got to know the real me......." This is what feeds the personal messages/requests to try to break through the "noise" and be seen as a real person with shared interests or w/e.
