That bit is actually true.
It's well known that many players would be in front most times they play, but because of the house percentage, the longer they play, the more likely they are to lose.
That's why "winners" [not counters] are given enticements and comps to come back.
Many blackjack players who hit a run hard, can easily make up for all past losses and be in considerable profit, but they don't stop, thinking this is the day.

I once turned $250.00 in $30,000 at Crown, and I'm barred because I took my winnings and didn't return for months.

They explained how big winners must return and keep turning over, or they get barred.

But that was a long time ago.

I think most people who quit while they're ahead can win.

When the run isn't there, you just need to be able to quit and save it for another time, those that don't won't ever be ahead, because the losses will outweigh the hard hits on runs.

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