Actually the way it works is this:
You get 2 points for each movie ticket you purchase. Maximum points per transaction is 4.
Points are automatically calculated for you so when you hit the 10point mark, you'll receive a coupon for a free popcorn when you buy your tickets. When you hit the 20point mark, you'll receive a coupon for free drink. At the 30point mark, you'll get a free movie ticket. Then it rotates again with free popcorn at 40, soda at 50... til on your 100point mark you get free popcorn, soda AND movie ticket. After that you start over again on the rotations.
I joined a couple years ago and think it's great. Plus, if you're a movewatcher cardholder you can order tickets online without extra charges and on Wednesdays cardholders get free popcorn.