I think Bravo has started to realize how popular Real Housewives can be if you have interesting people on the show. New York lost the interesting thing a few seasons back and now some of the Housewives are being fired. Kelly Bensimon, Alex McCord, Jill Zarin and maybe Cindy Barshop. It makes sense for a couple of reasons. They are all kind of boring and they have been on the show long enough that they are making very large salaries. Bravo has told them if they do not find people more interesting that they could be back. I bet Bravo will have no problems finding some women who are more than willing to be dramatic and cause trouble and I also think this is even happening to an extent for Beverly Hills. I think after you have been on the show and start to get appearance money and some fame you start to focus on that aspect and making as much money as you can off the result of being on the show, and trying to create a public brand for yourself. That is why Real World switches everyone after a season.