[SunOfBeach]

if he has a database full of guys who play 1000NL, im not surprised that more than 10% are profitable. he should try datamining the 1/2 limit game for awhile, then see what he comes up with.

anyhow, the mistake hes making is related to a concept in statistical analysis referred to as 'survivorship bias'. google it and give him a lesson, but the cliffs notes version is that he keeps looking only at those players who are still around, and not at all of those who have already gone broke and quit - particularly if hes playing NL ring games with 5-10 blinds...