I'm finding that more and more, when I impulsively go to the theater and try to buy tickets at the door... I always find the only tickets available are horrible, like in the front row to the side. You want like F-6 and F-7 and get A-2 and B-2.

And if I even accept this, the people in the choice seats invariably show up right when all the trailers are wrapping up.

so - people buy tickets ahead of time, and it might be the only way to watch it from a reasonable seat.

This probably doesn't apply to off-hours like tuesday afternoon or whatever.