For a found-footage-style movie, there's a definite advantage in using unknowns, because it helps sell the illusion that it's real. A known actor would get in the way of the suspension of disbelief.
I came down to the living room one day and my wife was standing in the living room. It wasn't an illusion. I saw her out of the corner of my eye. The moment I saw her, she vanished.
The purpose of satire has been rightly stated as to strip off the veneer of comforting illusion and cosy half truth, and our job, as I see it, is to put it back again!
Photography is a kind of virtual reality, and it helps if you can create the illusion of being in an interesting world.
I am under no illusion that yoga is the solution to all issues! That's why I am a very open-minded yogi.