I've never understood why people pay for private galleries and movie clips when the internet is awash with good quality free porn. However, as an accountant, I have clients who do a mix of escorting and image/video content. The image/video content is a very good earner - so there must be plenty of punters out there who are prepared to pay for images/videos of girls they do/could have sex with. Perhaps the allure is knowing the girl in the picture?