but they use the same equipment and serve the same popcorn everyone else does
Well I'd agree with most of that, but the Cinerama is a fairly unique example.
When Paul Allen restored the Cinerama, he had the original velvet seat covers replicated and installed. It has up-to-date auditorium lighting (including a starscape), but they still kept the original '60s vintage art deco fixtures. The balance between updating the facility while maintaining the feel it had in the '60s is remarkable.
The Cinerama is pretty special in the technical department, too. Even with the upgrades I have at my place, they've beat me cold.
The main 35/70mm machine is a Kinoton... the expensive one. They also have a Christie machine AND one of the original vintage Norelcos (though it hasn't been used in a while). The center booth also is used when projecting Cinerama, and has one of the 3 machines necessary for that process. At one time, they also had a digital projector squeezed in there... and it's not all that big a booth.
They have both hard-wired and cat-5 audio links to the speaker systems, AND a completely separate (and original) sound system for Cinerama.
$10 to see a movie there? Yes... in a heartbeat. There's no other place in Seattle where you can still see such a huge screen, even in 35mm, CURTAINED.
What's also amazing about their ticket lines is that the Cinerama is no longer in the "beautiful" part of Seattle, is a huge single-screen theatre, yet still draws great crowds.