We as punters are always competing against that 15% take out , thats why so many punters complain that they only manage to break even with a number of good handicapping techniques.

Only if you are silly enough to bet with the TAB! Using Divi+ (or the Sportingbet equivalent), fixed price and Betfair you can easily reduce the "takeout" to around 5-7% without too much difficulty at all. (At the short end of the market you can reduce it to almost zero).

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"Computers can do that????" - Homer Simpson