Because a government would never sell the private information of its citizens to a private company?
http://articles.latimes.com/1990-01-02/business/fi-113_1_census-information
Mmmm, census info.
Lol, that article is deliberately misleading. The official census sent out every ten years is absolutely confidential, and is only published after 72 years have passed. Not even other government agencies have access to it, and certainly not private companies. The sleight of hand in the article is shown by the way he begins by talking about how everyone is filling out the census that comes every ten years, and then only uses the vague label of "census information" to refer to what businesses are looking at. They only get to see what is already public record, the less specific, less detailed surveys that the bureau sends out occasionally.
Surely not medical records?
http://www.hcpro.com/HIM-242642-866/Hospitals-patient-information-sold.html
That was a crooked employee of a hospital.
GPS data?
http://www2.canada.com/technology/info+sold+help+police+speeders/4697656/story.html?id=4697656
That was a private company selling
to the police, and it happened in the Netherlands.
Police data?
http://claimscouncil.org/news/2011/06/28/police-cash-in-on-car-crashes-it-s-not-just-insurance-firms-making-millions-selling-drivers-details
If this article is correct, then what's going on is a racketeering scam where the police are being bribed to drum up business for garages. The only members of the conspiracy selling any details would be the insurance companies.
Why wouldn't they sell data on where you have been? Yes the idea is abhorrent, but very likely. And there will be nothing citizens can do about it once its up and running.
Because this will be a gigantic database, constantly being updated, and it's main use will be of the real-time (or close to it) monitoring of the footage. It's not a matter of sticking a thumb drive into a computer, downloading it all, and passing it off to some executive. They would actually have to be a part of the whole thing, plugged into the system and all, which, like I said, is illegal and couldn't possibly be kept a secret.
And besides, what would companies have to gain from this, realistically? The scenarios you gave me all involve one person being targeted. Companies don't make money from individuals, they make it from lots of people. Do you really think they're going to be making dossiers on millions of people and hiring enough people to successfully monitor them all?