I do believe as well that most viral Prank/Social Experiment videos are staged. I worked in broadcast TV and I've been told stories from producers about faking pranks. You can have an idea on which are staged. I enjoy prank videos like most do, but most of them have a sense of staged-ness to them. All I do is forget about the reality and think of it as fiction and enjoy the video anyways.
They found a living doing it. Had better results.
Is it ethical? Morally correct? Maybe not. But it's up to them. As a viewer I laugh at the pranks and share them to make others laugh. As long as they're believable I don't mind.
LAHWF has seemed pretty affected be this for a while now. He finally spoke what he felt clearly. It's too bad he took the video down and didn't stand by his word.
It will be interesting to see how the pranksters react (if they even do).
oh and it's f'ed up if the youtuber tries to raise money with a staged social exp.