I hope I've made a cogent argument, over the months, that the live betting market regarding horse racing is THE IDEAL (although not THE necessity) when it comes to really making horse racing backing pay.  Market movers, or following the money, has been shown to be a very effective method for uncovering bigger priced horses who, it would seem, are laid out to win on that particular day.
These market movers can be determined only with the live market (or again as I showed last month, by doing the 16/1 system in your lunch hour).
Similarly, the system outlined in the eBook betexprofits (www.betexprofits.net) uses the live betting market, BUT focuses solely on the live betting market on Betfair.