Yeah, I'm not a huge fan of that either. Although, I really don't watch any sort of Let's Play videos unless I'm interested in the game. That's unless watching Twitch counts as a Let's Play, which it sort of is... I think? I mostly watch Hearthstone on there.
I've seen some articles about how much PewDiePie makes that came out in the past week or two, and how some are up in arms over it. I don't know why anyone is surprised that people would be unhappy. We all tend to ascribe an amount of effort and value to something, and I think most people tend to be cynical about pay in the entertainment industry. When you hear that Robert Downey Jr. gets $50 million for The Avengers, you can't help but raise a brow. When you hear that a guy on YouTube that plays video games, makes funny noises, and generally acts out makes $7 million a year, you're going to raise a brow. Although, to be fair, we generally ignore any difficulties that exist for those people. For example, most people probably don't know how much time goes into editing videos. Albeit, Let's Plays are probably a bit easier than other types as they usually lack a lot of visual flair.