Selling it would be bad business. By just offering ad targeting to their customers, the customers keep coming back. Once they sell it the customer doesn't need them anymore. (used to work in an advertising-based internet business. This is how it's done.)
I learned a long time ago to stick a few band-aids (plasters if you live in the U.K.) in my wallet. They take virtually no space and get used surprisingly often, either for you or for someone else.
Selling it would be bad business. By just offering ad targeting to their customers, the customers keep coming back. Once they sell it the customer doesn't need them anymore. (used to work in an advertising-based internet business. This is how it's done.)