One of the problems with regular porn is that a lot of it is fake. The girls are just fake moaning to make you think they are enjoying what they are doing and they make up a personality that they think you will want to see.
In reality they are likely just thinking about doing laundry when they get home and what they are going to have for dinner. With real live sex cams you get real women, not pornstars who are on their personal webcams in their own homes a chatting with you. As one girl put it, even if you just come for the booty and the boobs, you are going to get some real personality.