Out of curiosity I also did a Bet Selector test, here are my results:

Range: 31/1/2011-31/1/2012
Races Bet: 601
No. of selections: 629
Wins: 115
Runner S/R: 18.3% (you can get this info, not just race s/r)
Profit/Loss: -$154.50
POT/LOT: -24.6%

Rules: Last start winner, days last start 1-7, age 3-5
These results were for Australian races only.