I believe due to how much it grossed here in the states, I think it was the largest grossing movie this summer, beating all the Big Name Blockbusters. In this regards I'm sure a theater here or there still had this playing, similar to a re-release of a movie as they have been doing lately, gets every last drop left in the tank. I am suprised though why they did not shoot for a Thanksgiving Week Release, this would have spiked sales for sure.
On a side note, I also got a copy from Amazon UK, it is 100% Region Free and has both the Theatrical & Extended Cuts. It is the exact disc we will recieve here only with different cover art. So if you're like me and do not want to wait another 2 Months this is the best option!