Of course, those patrons who play very little or are accompanying real players make up a large portion of this group, but there are many players that are actually able to win over a long period of time.
Research shows that while most players end up losing money at their favorite casinos the high cost of the property, staff, and complimentary items keep casinos from beating everyone. If you think nobody is watching, think again! Of course, you never know which ones are being watched at any one time and everything is digital these days, so video from every camera is available for later viewing.
While older casinos like the Cal-Neva in Reno didn't bother with camera coverage for all of their table games as little as 20 years ago, modern casinos have so many cameras that the surveillance staff, as large as it might be, can't even watch all the views. Ten Things You Might Not Know About Casinos