So let's move on to your chart. I don't play poker, but I see poker and blackjack (what I do) as 2
very different things. In poker, somebody at the table
has to lose! Your chart reflects such losing players. In blackjack AP, no one has to lose and in the long run, if everyone plays a strong game, there won't be losers like in your chart.
Key words: Long run. For a blackjack AP, 100,000 rounds is not a lifetime. I play 60-70,000 rounds annually and I used to play even more when I was playing lower stakes and really grinding. I'll bet I have had years of 100,000 rounds played.
I would say it is possible to have 100,000 rounds and be behind. It has never happened to me, but I know players that have had losing years. I personally have had 4 different 6 month periods of losing play, that would be 30-40 thousand rounds, and a couple of those were probably closer to 50,000 rounds.
But a lifetime of blackjack play for an AP is millions of rounds. Notice the plural. And if someone is behind after that amount of play there is something else going on. It is not a case of they are on the lower end of the bell curve....it is a case of holes in their game or chasing losses or some other non-AP issues creeping into their game. One one of the popular blackjack sites, there is a frequent poster who has mentioned that sometimes he is hesitant to throw out his max bet, especially after a loss or two. THAT is the kind of thing that can lead to a losing so-called blackjack AP....holes in your game.