But, Shaun, he is target betting.

Look at his example of the runs of outs. If the fifty is not won in this race the bet goes onto the outlay for the next until the number wins. So in your example, if 1 wins, 2 is backed next time to win $62.50 and 3 to win $58.00. Of course, if 1 does not win, the aim for 1 is $84.00 next time --- and that is the way things can accelerate, especially if 1 (or any other number) is odds on or nearly so.