A lot of the webcam models we feature on this site are free. What that almost always means is that they are free to watch live but then if you want to interact with them through talking to them and requesting them to perform certain actions then you have to pay. Another way that webcam girls and guys profit from the work they do is through selling old footage of themselves from popular shows so that visitors who want to see more of them can still carry on even if the model is no longer live.
An even more niche way of profiting from the webcam shows is to purchase physical items from the models that they have used during live shows such as knickers or even sex toys that they then post to you. Not all models do this but as technology gets better and webcam models learn how to monetise the shows they do this practice increases in occurrence.