Possibly because the people who you can sell that data to are prepared to pay way more per "product" than the people trying to sell you fast moving consumer goo

Possibly because the people who you can sell that data to are prepared to pay way more per "product" than the people trying to sell you fast moving consumer goods or ICO de jour... Wouldn't surprise me at all to find there's a market where intelligence services can purchase lists of TOR users - for example...