10,000 doses of LSD; that is, 10 Bibles, or 100 sheets. Few people ever possess an entire thumb print of LSD, only acid Chemists and distributors.
There are stories about people pressing their thumb against LSD crystal, or taking large doses by saturating one's thumb, but these are probably myth.
About 10,000 doses of LSD can fit on the tip of one's thumb.
A thumb print sold by individual doses is worth a $100,000 USD, at $10/dose