We didn't go see the double feature of DS (the other one playing was that Snow White movie) at the drive-in a few towns away because of the heat. Both played for just Thursday-through-Sunday night (the only time it's open) and from what I heard, despite the heat, there were lines of cars waiting to get in. I guess we were just too wimpy. It would've been fun - I haven't been to a drive-in for 30 years, but that heat was just too much, even in the evening.
Once again, when it costs a gazillion dollars to see a movie, especially in this economy, people stay away. When I saw DS at full price, the theaters were less than 10% filled (if that much I'll wager it was only around 5%). When the cost is cheap, a downright bargain, the theaters are filled. When I saw HoDS back in the stone ages, where it cost 35 cents (for a double-feature), the line extended down the block and around the corner and the two balconies and box seats (the uppermost balcony and the box seats technically closed because, before restoration, they were ready to collapse, but back then government agencies weren't as picky) were packed. Take a note, Hollywood, take a note.
Gerard