In my ventures which includes Atlantic City, Vegas, Connecticut, South Florida, Reno, Southern California and parts of the Midwest high limit rooms and those with baccarat and no HL rooms I have made the following well observed and 3 decade long observation of.
It is enormously harder to win and walk away with a larger bankroll & your win money, as compared to a smaller one. All in proportion, one can say small from a few hundred to $1k as compared to $5k to $20k. Or one can say small from $2k to $10k as compared to $50k to $200k.
In my mind, it is because we tend to 'plateau' out and go from there. I have wrote about this in the past and if you look back through my posts you will find that, I will not repeat about 'plateauing'.
I have witnessed and observed many more players in the 'smaller' bankroll categories by far, get up and walk away from the table calling it a session/day/trip--whatever. The larger players tend to play on until they are bust. Yes, occasionally they do walk away and call it a session, but those numbers are trivial as compared to the 'smaller' bankrolled players.
This is not meant to insult or accuse anyone here of anything. Just my observations and witnessing over the years. Experience and knowledge as to how dangerously easy and hard this game is will assist those with realistic expectation that can practice 100% patience and discipline each and every time.