Though I've not set up a "Skype" account, my computer came with it preloaded. The one time I thought I wanted to set it up, it wanted to reconfigure my browser and ad more things, limiting my control over data privacy (in my opinion). Even with a good System Protection, I wasn't comfortable with it until I know more about how it works, so, I decided against it. FB has become intrusive enough and, when using Google Chrome, you'd be surprised how much of your information is going to places you weren't aware it was going.
As I read some of the Twitter Posts inviting fans to join the basically; by appointment only shows offered on Skype, somewhere I picked up that the costs can range upwards to what a member would pay for a years subscription to this site, and more ($100-$200 per viewing). While the models or whom ever would get more of the money than say...other forms (porn produced by studios or Web Cam shows) the disadvantages I would think are: No downloads, limited camera views. GoPro's might be used but, you get a limited view of action if someone is holding a camera while performing, or having a camera set up somewhere else in a room.
And this is just my take from reading and following posts and blogs. I've never paid for a Web Cam session, or a Skype showing.