what are you actually doing in regards to gambling then?
do you have a pile of cash and bet that a certain horse doesn't win?
need more details or else i call BS.
You want him to tell you exactly how he makes money on betfair?
I'd guess that he's going to be reluctant to explain exactly what he does, its quite likely that the result if the race is irrelevant to him and he's more interested in the changes in the prices prior to the race beginning.
Then again maybe he sits trackside with a laptop, or maybe he's written an app to use betfairs API and arb any small price discrepancies... It's quite plausible that there are people out there making a living from betfair (and by the nature of the market many more losing money).

