I have been doing this for 200-300 hrs now. Over this time I estimate I have sat with around 1000 different players.

Out of these I have seen maybe 4-5 people I thought were counting and of them maybe 1 was playing a strong enough game that they would have a material edge, in another case the player in question wonged out before I could really verify they were an AP. In addition I sat with what I believe was an ace sequencing team.

I am usually alert for this sort of thing and don't think I have missed too many. On top of this I would say only around 5% of people play bs mostly by bringing a bs card to the casino.

My question is, is this consistent with what you guys have seen and if so, why do casinos bother with such heavy countermeasures?