If you had a clear list of "these sort of news items/OC from friends makes me more susceptible to being convinced by questionable ideas/donate money/stay up at night." then you could perhaps take steps to preserve your ability to stay more rational, more the way you want yourself to be and less easy to manipulate by ads/partisans/etc.

That sounds like it would be very useful, but doesn't really have a (monetary) "value" in the sense that most people use when talking about sharing the profits of the Data Economy.

It'd be much more interesting to see that sort of data sharing/access occurring than simply saying that people are entitled to some percentage of the profit that was "generated using their data" (which would be highly susceptible to creative accounting).

Preserving the privacy of individuals would still be challenging though.

Let's say on average you need to see one hundred ads before you see something you want to buy. Now if you had personalized ads, maybe on average you need to see ten ads before you want to buy something.

If you are already looking through a bunch of ads for the sole purpose of trying to buy something, then your personal data is valuable to you because it saves you time. But that's definitely not the situation with most big tech products.