I haven't seen the whole episode but what I did see tells me even more that the only reality we're seeing here is that they once picked "Real" people. The rest has to be scripted. It just doesn't make sense anymore for it to be real.
Maybe each week they're told what the story line is and they're to "improv" the scenes.
I no longer think there is any animosity between Teresa, Melissa and Joe G...just made up for drama.
I just believe none of it is true.