I did not think Kim Richards was really a meth addict. She does not have the normal signs. Usually when you see a meth addict they can't stay still, their teeth (which they are losing) and fingers are stained and would be tough to go through an entire day of filming without going insane. Brandi Glanville says Kim does meth though and does it in the bathroom which would explain how she could at least make it through a day of filming.
Real Housewives has apparently become like SNL. You have cast members and then you have featured players. Once you become popular enough, you get to be a cast member and the way to do that in Real Housewives is to start a bunch of fights and be the person everyone talks about. With Camille getting along with everyone and not willing to have sex with her tennis pro on camera, there really was not going to be much drama. So, enter Brandi Glanville and Dana Wilkey, who seems to only be on the show to promote another show and is a friend of Taylor's.