my comment on systems is that when presented to the punter most systems can be proven to work usually statistally or on past records.
when applying these systems in practice either by me or anyone else they dont seem to work like they were demonstrated.
punters who complain are then shown that had they followed the system they would have made money.

the breakdown usually happens because the punter goes golfing on the good days or doesnt have the fortitude to follow through or the money.

this is why good punters look for higher strike rates or factors that dont present formidable issues when betting the system.
e.g. betting level stakes.

many of the top punters and big punters historically have been what is known as fearless. i dont think there are many of those around or many that survive.

i dont want to imply anything other than my experiene and that is that when offered concrete evidence that a system works historically it is most likely correct.