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Thanks gdaviet. Didn't think of that... was hoping there was an even easier way I guess 
Did the same analysis on my DB of 2.8 million hands, mostly from 100NL FR. The numbers come out strikingly similar:
Total unique players: 16,286
Total hands: 2,839,925
Avg. winrate: -3.65 BB/100
Total lost: $103,657
Winning players: 6,165 (37.5%)
Losing players: 10,190 (62.5%)
Players with more than 2,500 hands: 122
Avg. winrate: +0.74 BB/100
Total won: $3,742
Winning players: 74 (60.7%)
Losing players: 48 (39.3%)
Players with less than 100 hands: 11,106
Avg. winrate: -10.45 BB/100
Total lost: $78,265 (75% of all losses)
Players with less than 50 hands: 8,065
Avg. winrate: -17.17 BB/100
Total lost: $56,293 (54% of all losses)
Players with less than 25 hands: 5,099
Avg. winrate: -30 BB/100
Total lost: $34,086 (32% of all losses)
I've been thinking about this data, and while it's interesting, I think there's a simple explanation for it... very, very few poker players' final hand at a given site/level is going to be a win. Since all these hands are a snapshot, of course we're going to catch some players who just made their deposit, some who are in the middle of their poker "career" at this site/stakes, and some who are at the end. But since the end is almost always marked by a loss, the players with the fewest number of hands are going to be almost all losers. Unfortunately, because these databases don't include every hand each player has played, I don't think we can draw any meaningful conclusions (besides that the pond needs constant restocking with fish, because a lot of them leave after they lose). To sum up, I think there's a serious sampling bias here.
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