To be fair, no one is forced to watch these people. If I could make tons of money from people watching me do boring or dumb shit on YouTube, I'd absolutely do it. We may find no point to it but millions of subscribers do. I say more power to these Internet celebrities. They're harnessing the money-making opportunities of an evolving technology, like people have done for centuries. I'm sure there were people in the 40's and 50's complaining the same way about television as we do about idiots on the internet.
I read about one of those people who has a page where people watch his commentary as he plays video games. In ad revenue alone he makes more in a year than I have in any five years of my life combined. If I could make that kind of cash just posting videos of myself talking about sci-fi shit I'd do it in a heartbeat.