[Sniper]

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You will only have a small number of hands on most of the players in your PT database. So you will have some long term losers that went on a short-term win streak and have positive numbers in your db, and you will have some long-term winners who had a short-term bad streak and are losers in your db. Since there are so many more losers than winners, you will misclassify many more losers as winners than the other way around.

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No, do some datamining and you will see for yourself that the 40/60 for ring game players holds up! These numbers, roughly, are consistantly reported by everyone.

Tournament play, where there are very few winners, brings down the aggregate numbers of poker players making an annual profit.