I think consumers are starting to realize that it never is cost effective to purchase a film. At least at the release prices of about $18.
Finances are a factor, but they are not the only factor. At least for me.
When I do my monthly budget, I leave about $300 for misc. purchases (outside of the entertainment line item). $20 on a movie is not really going to make or break my world.
But, $20 on a crappy movie (that its previews looked so good) that will take storage space in my house is something I look at and feel strongly against. I hate the ripped-off feeling that ensues.
As I have stated in my post before, I buy movies that I have already watched just to have them. It's not convenience, it's really about "having" that epic movie in my collection and maybe even passing them on to my grandchildren (if you're reading this my grandchildren, good luck finding a DVD player ;) ).
The movie industry really mastered the art of previews. They show you the best bits of a movie and string them together creating a false sense of a very intriguing plot.
They really shoot themselves in the foot when they do that, and I hope that they start to put less emphasis on the previews and more in the direction and story-line/character development.
I'm obviously not disagreeing with anything you said (aside from the 100% convenience), I just wanted to rant some more about it :)