BUSR winners are not paid at full-track odds. BUSR stands for Betting Without, which means that the bettor is taking a price on the horse without the track's starting price being included in the calculation of the payout. The payout is calculated based on the odds offered by the bookmaker or exchange at the time the bet was placed, rather than the actual starting price of the horse. Therefore, if the horse wins, the bettor will receive a payout based on the odds they took, rather than the full-track odds.