The only other private-based site I have a experience with is Cams.com, and it structured similar - you chill in free chat, and people can take you private, where others can join, or exclusive, where you're one-on-one. If you don't mind Skype, you can offer phone with cam on Niteflirt, or use a Skype listing site like SkyPrivate or Cammodeldirectory.
There are several Streamate models who prefer exclusives, and have their privates priced as high as the option goes, to encourage people to stick to exclusive rather than premium chat.
Others offer just a tease or basic masturbation show in premium, and more unique shows in exclusive.
A third option is to operate premium as "first come, first served". This is my preference. If I'm in premium doing a foot fetish show and someone joins in the middle and expects me to get naked, I let them know that the other person took me private first and gets preference, but they're free to stick around and wait, or come back in a bit.
