Currently Being ModeratedMay 9, 2012 7:51 AM (in response to peppershouse)
Because that's the way the owners of the rights licensed the movie. Probably they think they'll make more money selling you the Blu-Ray disk, which often includes a lot of extra cruft and hence costs more.
Currently Being ModeratedMay 9, 2012 11:17 AM (in response to peppershouse)
It may also be available to buy in HD in a few months. Just keep checking the movie every week and be ready to buy it when it is available.
I've seen movies that were for rent for a few years suddenly become available for sale in HD recently.