Care to guess? According to SharkScope it is 26% of players. They certainly have the data to back it up. What I find interesting is that the 26% is constant regardless of the type of tournament. In other words if you filter the results for heads up, single table, etc it is still 26%.

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http://www.sharkscopers.com/blog/thestatistician/what-fraction-online-poker-players-are-winners