I think this may be due to the Quadrella. They choose the races that seem hardest to pick a winner in as the quaddie races( and these are usually on the second half of the card ) . Same as they used to for the superfecta when that first came in. I think in the hope a roughie wins a couple of legs of the quaddie and people see a $56,000 divi and think " I'll have a go at that " and invest more. If the faves won the quaddie all the time and the divi was ******** there'd be less investment