Staking XPT's Winners

New idea.Xpt picks 5 and often the fifth pick wins.Drop out the favourite, in other words no bet.That leaves the fifth pick free to bet on.Or drop out the favourite and with that unit box the 5 in a quinella.
If the 5 were backed in a box trifecta, and they come in often enough, the picks could be dutch bet to save the trifecta bet amount