Pretty much hey.
Horses you could be a bit more tactical. Theres a cool horse racing refund guide on this site. What Richard suggested, and it does work, is to combine a few bookies for every race. Like today there is Points, WH, Crown, Neds and Sportsbet ALL at doomben so u could back and lay say the top 3 horses with 3 different bookie accounts per race and increase chance of getting refund.