$3 to $4 to rent, $10 to $15 to purchase
Hell, no! That's too expensive for a download. I just rented a movie for $1.99 at a bricks and mortar video store this weekend. DVD, doble sided special edition, all kinds of crap. Why pay double for a download which will be lower quality (I'm assuming), have less features -- and not work on my Linux machines anyway? Just for the convenience of not spending the 15 minutes to go to the store? Why, a little sun is good for you, vitamin D and all that.
When they get to $1 to rent, $4 or $5 to own (without DRM crap), then I might think about it.