Also have the fine scale exponentially by data items.... data set of 100 people with 2 items (name and email = $400 total or ($2x$2=$4 per user x 100 users)).
Data set with 1 million users and 10 fields per user would be $1B and $1,024 paid to each person...
Then make companies bond their liability - with recourse against anyone up the chain of title if the data was purchased...
Perhaps a bit draconian...
Observations I make are mine, if I observe you it's my observation.
I can tell stories about my observations, but if I make public statements about you that are false, that's a tort.
Your security clearance report stolen by the Chineese from the US government OPM database[1]. This could be a real problem for you. Information anyone can get by paying for it? This would not be a problem if credit fraud and credit reports were not such a big problem.
[1] https://www.nytimes.com/2015/06/05/us/breach-in-a-federal-co...
Coincidentally, we don't have the same types of mass identity theft issues that USA has.
I was specifically giving an example of why your observations don't automatically mean you have ownership today. I'm personally in favour of laws that ensure such observations are more explicitly owned by the observee in corporate scenarios.