If the record-breaking horse wins his third Gold Cup Ladbrokes reckon his career will have cost the betting industry upwards of £100 million.
The Gold Cup itself is worth £50 million in bets and is second only to the Grand National in triggering a punting frenzy.
Kauto Star is the 4/1 second favourite behind defending champion Long Run (6/4) and the bookies reckon over half of that amount will be bet on the two big rivals.
David Williams of Ladbrokes said: “Kauto Star stands on the brink of history.
“He has clobbered us a few times and, if he wins the Gold Cup, he will have cost the bookies over £100m throughout his career.
“If they erect a statue to Kauto Star they shouldn't ask us to fund it.”