You could use something like Piwik for your Google Analytics problem - it's open source - although I don't believe it or any of the other open-source solutions scale well beyond a single box, so if your website takes off you'll have trouble.
Many analytics tools exist that don't have an advertising arm - in fact, most don't. They charge developers directly. Mobile device analytics are a bit of an aberration, mainly for historical reasons, although paid solutions there also exist.
For the user to 'pay' by giving away behavioral information, they'd have to suffer some sort of economic loss. They don't. (As an aside, a lot of the arguments made in favor of music or application piracy are surprisingly relevant to the collection of behavioral targeting data.)
I believe that ideas should stand on their own, so I generally don't disclaimer up my posts. For example, I'm always irritated when someone dismisses a politician's stance because of his donors, as if to suggest he was bought. In the politician's case, he has the donors he does because of his ideas, not the other way around. In my case, I have the economic interests I do because of my ideas - again, not the other way around.