When using a bonus bet, it's important to remember that the stake itself is not included in the payout. Unlike cash wagers, where you receive both your stake and winnings, a bonus bet only pays out the profit from the bet.
For example, if you place a $50 bonus bet on a trifecta and your payout calculation results in $22.91, you would not receive a payout because the winnings did not exceed the value of the bonus bet. In this case, since there were no profits beyond the bonus amount, there is no return.
This is a key difference between bonus bets and cash wagers—bonus bets offer the chance to win without using your own money, but they only return the profit, not the original stake.