Taylor had worked Saratoga one summer for the pioneering Lee Eaton and, as early as 1978, dipped a toe in the same water. A first seven-yearling consignment at Keeneland included a first stakes winner—since followed by 126 Grade I winners raised or sold, including 10 last year alone. "It was a natural extension of what we were already doing: a lot of customers you boarded for needed to sell," Taylor says. "And I thought, well, if Lee Eaton could sell a horse for $100,000 and make $5,000, that's more than...