If you come to my restaurant isn't in my info that you walked in my door, sat at my table, ordered my food? Why do you think it's your info? When two interact both sides get to remember the interaction.
On the one hand, it seems obvious that you have a right to observe, collect data, and sell it. On the other hand, ick.
> 1 : one that spies: a : one who keeps secret watch on a person or thing to obtain information
The question is whether you can __sell__ the information that I had three double cheese burgers and extra greasy fries to my health insurance provider.