Movies here are damn expensive too. About $8
I don't go *that* often myself, but every once and a while I will go with some friends to see a new movie that looks particularly good.
Personally I don't buy food or drinks at the movie theatre. It's too expensive. Most of the time I don't need a drink or something to eat, but if I do I'll bring something from home or another store that I can sneak in with my pockets. They never check, and if they dared I'd break their arm.
As for the previews....I think they are RIDICULOUSLY long before ANY and ALL movies. I refurse to sit through them. When I went to see War of the Worlds, there were 2 showtimes near, 7:00 and 7:30. We were planning on going to the 7:30 one, but when we arrived at the theatre at 7:10 we decided to go to the 7:00 because of the previews. Sure enough we didn't mess anything, and sat down for like 1 or 2 previews still going on.
War of the Worlds I thought was good.