What Do Bloggers Owe Their Audience?

Ultimately I don't think that Bloggers owe their readers anything. Nobody is paying for a subscription to someone's blog so what is the Blogger getting out of this deal? It's just a way for them to express their opinion. Having an audience that wants to control what is being written kind of defeats the purpose of it being the blogger's opinion. I think that if you want news or help on something personal and you're too cheap to buy a newspaper or a book then you shouldn't really be demanding something from a person that's volunteering to put their opinion out there.