Hammers is spot on with his logic there.
Pure mathematics dictates savings on TAB take-outs when playing exotics.
Always gets me why punters give up when they have selected the winner.
Usually the weight/formlines that have pointed you to a winner have got you a long way down the track, to picking second and third placegetters as well.
Most punters do the form in the last 5 minutes prior to a race, and consequently the eventual winner gets backed in noticeably.
Doubles etc lock you in at a fixed price an hour earlier.
Trebles versus trifectas- They say it's easier to pick 3 winners in one race than 3 different races, however if your selection is likely to be heavily backed late then trebles etc offer value. Try 'em both and stat. the long term effects.
I'll average over 300 bets daily aiming for a single digit percentage profit.
The crux of the matter is then to "slice and dice" your betting history so that you know your best weekdays, months, classes, bet types, tracks, states, agegroups, odds range, even hours of the day.