Bloggers want and need the votes and the comments, they need to let their followers know they appreciate the support, so many of the youtube bloggers just do not get that.
I see the opposite of this. At least on YouTube. There are many comments on YouTube. Even the smallest YouTubers and the occasional video uploaders are receiving comments. And many of those comments are funny. Nowadays YouTube is probably one of the best social networks seeing from the social aspect. It just works. Most people go there mostly for the content (or person or personality of the YouTuber), and not for the just/only money. This is why it works.