I do beleive they run on a pool system.

The trick being i have found that because of this the smaller bets you place the more little return you get. The higher you bet the less value for your return. Without the amount of people using them like tris and quinellas the harder it is for a decent div.

The saturday idea has some legs but ask your average punter at the TAB or Pub and they will tell you they dont even know how to put one on.