I have been a member of the Stubs reward system since it came out in 2011-ish. I have racked up over 200 different movies, not including ones I've seen twice or the amount of tickets I've purchased to each. With the amount of movies I see, it has always been worth it for me to pay the yearly membership, which is only like $12. What you get with this membership is unbelievable for even the casual moviegoer.
Perks:
$10 credit for every $100 you spend.
Free one size upgrade on fountain drinks and popcorn ; Small-medium, Medium-Large
And the new, and most incredible part of the deal, 50% movies on Tuesdays. You pay $6 for a ticket at any point in the day on Tuesdays! I saw 3 movies last Tuesday, and am going to see two more today. It is essentially buy one get one free.

Just thought I'd share this with the community being that I love it, and clearly there are some moviegoers in this forum.

If you didn't know about this, or were undecided on whether it is worth it, I hope this post has helped you out ; let me know!