The big advantage the punter has over the bookie is that he doesn't have to bet on every race.
In the race you mention, most sensible systems would not have had a selection in this race for two reasons-
(1) Odds on look on
(2) Don't back a system horse if there is an odds on shot in the race
Therefore we didn't win but importantly we came out square
That wouldn't be a great rule for a system that targets odds on shots.