Actually these days a lot of reality shows seem to be populated mostly by actors (or in Zoolander parlance various slashes e.g. actor slash model). That isn't quite the same thing as being completely staged though.

Looking through the acting 'careers' of most of these people (I saw a couple of their websites after reading about the 'controversy' on Wikipedia), I think the are more 'aspiring' actors than anything.

Granted, I don't see why people would care all that much. I mean we have people running around in tights being lead by Stan Lee and they are getting all detail oriented?