Without knowing how companies actually use my data, I can't put a price tag on it myself. That means I can only rely on the price put out by the companies that

Without knowing how companies actually use my data, I can't put a price tag on it myself. That means I can only rely on the price put out by the companies that collect it, and if they collude to keep prices low, it doesn't matter if they're caught, because they already have the data. I also don't know the entire network that my data transits with the amount of money that gets paid for data -- Google could sell to some small company which sells to an international company, which sells to a shell company and ends the trail for most of us. I suspect that internet and real celebrities will be paid orders of magnitude more for their data anyway.