"None of us is as [valuable] as all of us," is a saying that has been around for decades, surely there are business rules that have cropped up to support a valuation of this scenario in the meantime.
I'm not saying anything different. Whenever a business/individual sells information at a value, they'll be taxed on the sale, just like anything else. OP mentioned selling a cars worth of his own data, which doesn't exist.
