These sites do not publish public accounts, so surely no one knows their profits. As far as I know, Chaturbate is by far the biggest and most profitable webcam site, but you can also broadcast on Bongacams, Stripchat, Camsoda and others, they are also quite big and popular. On the webcam models forum thecamsite.com you will find a list of popular cam sites, there are no less than ten.