I guess I make a thumbprint database. Anyone who submits a previously unseen thumbprint pair to the database gets a dollar sent to the account they specify. That way, each thumbprint set is effectively worth one dollar, minus the trouble of submitting it.
Aggregators emerge to pay other people a bit less than a dollar for their prints (upon confirmation of uniqueness), and they leech off some of the money, but they distribute a lot of it and reach people and places I couldn't.
Some new problems to solve are 1. Can I avoid hosting and comparing uniqueness of eight billion thumbprint sets? 2. How do I avoid accepting fake, computer-generated thumbprints? 3. Is there a better alternative to thumbprints?