An alert from a local security firm states that the 41-year-old actor was spotted him "moving his money with the count," which apparently has something to do with counting cards. He was allegedly using "perfect basic," which RadarOnline.com reports is "a common term for introductory card counting."
Counting cards is a way to keep track of which cards have been played already, so you can make smarter bets. For example, if you needed a low-value card to hit 21, you wouldn't bet if you knew they'd all been played. It's one thing to try to keep track of this in your head, but Affleck seems to been using the system of moving his chips to tell which values were still left in the deck.
The practice isn't illegal, but it's a big no-no in Las Vegas, even for A-list celebs like Ben Affleck. You'd think they'd let it slide, just because having him there would bring in more traffic (and therefore more dollars), but nope.
Vegas takes its gambling very, very seriously,Mr.Batman? EH. 
