In a previous life as an advantage gambler (there are always edges somewhere, but you better know you actually have one and know why you know and your risk of ruin etc), I would say that "how can we keep exploiting this below the radar" is as common of a discussion topic as "what is there to exploit"

Card counting is a perfect example - you absolutely can count cards in the right type of blackjack, and you absolutely can get an edge and casinos absolutely know this and can ban you no questions asked if you are tagged as an advantage gambler.

Always rubs me a bit the wrong way actually, given that by its very nature the casino is advantage gambling 99% of the time whether you know it or not...