It can happen
I know for sure that I have been cheated on at least two occasions. The first time was about 40 years ago at a single deck game at the old Star Casino in Winnemucca, Nevada. (I think single deck was the only game dealt at this casino in those days.) The dealer was so clumsy that the second could have been spotted by anyone who happened to be watching the deck as he dealt. The first time I saw it I was amazed that anyone so clumsy would try it. The second time I saw it I raised hell, but the floor denied, took the deck from the dealer, queering the order of the cards in doing so. And this was on $5 wagers!
The second time was about 35 years ago at Binion's Horseshoe in downtown Las Vegas. As in the Winnemucca episode, the dealer was no Steve Forte. This time I said nothing as the Horseshoe was still into rough stuff in those days.
I realize these events occurred many years ago, but I don't think that is a reason to believe that it still does not happen. The casino does not have to be involved in the act. It can be a rogue dealer diverting money to a friend. If the cheat is good, you will never see it. But I do agree that you are probably safer at the larger stores.