Not really what you ask for here, but you are not posting a guide to "world class gambling", but misleading information to players that do not know better, so here goes.
So "world class gamblers" analyse patterns and practice their skills to play,
with the exception of poker, games where the outcome is generally something they can't impact? Sure there are strategies in the other games that gives a higher win chance than less optimal strategies... But the edge will remain with the house not the player, and you know as well as I do that there's no system in Roulette for example that will lead to long term profitability for the player.
That sounds more like a gambling addict to me.
Setting a loss limit is definitely a smart choice, but why should the money they bring to the table have anything to do with the length of the game or why would they ever need to stay till the end? Simply walk away when you've lost what you intended or walk away whenever you are happy with the amount your up. With table games with significant house edges the player is definitely better off doing a hit and run than staying to see how probability eventually bite their arse.
As for starting with a sizeable bankroll, the average player will be far better of by not chasing losses than having some massive budget to "rebuild" a bankroll from after the eventual loss.
Or you know, just enjoy gambling for what it is and do whatever you find relaxing and enjoyable at the same time. its meant for entertainment not income. Personally I enjoy my low roll punts combined with a bad TV series
My lack of concentration will never affect the RNG.
The best way to gamble is definitely NOT to take stupid bets or play weak hands in poker just because the pot is big, I've seen better gambling advice than this from Bloatgoat.
Also there's absolutely no scientific base for it being better taking risks when your down by a little. If anything it makes more sense to do so when your up, at least you can still walk away with the initial balance that way.