So like always the dummies want something for free? The ads are there for the same reason there are ads anywhere.
When it comes to Youtube those ads help people like me pay their bills and continue to produce content for others to watch. I'm not paid a huge amount from them, but it's still a nice little bit (anything extra counts). The least people could do is watch them and if they don't want too then they can click the skip button that pops up.
And no, I won't link any of you to my channels.
10-30 or 20-15 second commercials in an hour
I've never witnessed any website serve that many ads. I'm calling BS on that unless someone can show an example. The worst I've seen is the Discovery Channels online player with 8-15 second ads for an hour.
Yeah the ads are annoying, but you know what I'd rather sit through an ad or 2 and get the videos for free.
More or less this. It also helps you get fewer ads then on the TV as well.