Don't forget "And it's useful for a lot of other things other than movies", which is what really tipped it over the edge for me. Video games, streamed TV, second computer monitor, family photo viewings, etc. We're getting pretty close to "optional monitor for your cell phone", too, in the slow-but-inevitable substitute-replacement of your laptop by your cellphone.
I'd say "I just talked myself into upgrading my home theater setup", but we never go to the movies. We just watch them when they become available to download from iTunes. It's great. We make better popcorn, too (secrets: paprika bloomed in the butter, microplaned parmesan cheese, Spice House cheese powders).
