There is a type of gambler known as a "whale". This is someone who tosses around black chips without a second thought. Someone who bets like this and knows how to count can be a serious threat to the casino's bottom line. But there is another kind of threat from a totally different type of player.
The way we play can be best described as "termite" play. Scraping along at $5 a hand until you can shake a good count out of them, pushing some extra chips in the circle when this happens, but playing a perfect decision matrix and grinding out a steady and consistant (but small) profit. $36 here, $8 there, grind grind grind. Not many "spectacular" wins but no $700 "shoes from hell" either. The same way a termite can chew away at a house for years and years with no one noticing and one day they wake up and the whole house falls down from the damage. 1000 termites and all of a sudden the casino has a serious infestation.
You might say "big deal you win a few bucks". We always seem to win at least enough to pay for our vacations, and merely the act of transferring money from the casino sector of the economy to other sectors (food, gas, lodging, other goods and services) is gratifying. Casinos are a 3 card monte industry which will allow one to get drunk and lose all their money, but harasses those who gain enough skill to make a profit. And there is also the time factor with money; if you can start a trip with say $1000, do all your eating and stuff, and end the trip with that same $1000, you've lived for free during those days, which is something most people can't say. A termite can start with a $1000 to $5000 bankroll and just play very carefully, only playing the games with the best rules, including wonging and/or walking in their strategy, and never overbetting the big positive counts... and chew away at them forever. Any matchplays, lucky bucks, and/or other casino promotions must also be utilized to the max. You won't get rich, but you won't end up in the toilet with the other 99.9% of the gamblers either.