[Zanni]

Card counting is an "easy win" only in that it's relatively easy to master. With a bit of practice, you can gain a consistent (but small) edge. The problem is, the variance is enormous. You need a large bankroll to sustain the wins, and you need to put in a lot of hours to get into the long run. That's a major reason most successful counters play in teams.

Of course you're right in that once a casino notices you winning, you're a target for closer observation. A six-deck shoe isn't much of an obstacle, though. In Atlantic City, they'll flat-bet you (adjust the table limits so you can't vary your bet). In Las Vegas, they'll just outright ban you from playing.