Personally I rent more movies than I buy, mainly because I usually (90%) will not watch a movie more than once. However my small collection (about 25 DVDs) comprises mainly concerts, stand up comedy and complete seasons of tv shows I like such as Friends and Sex and the City.

I have a Blockbuster Rewards membership, which has a few neat perks which make it much more reasonable to rent movies for me, such as:

(i) I get one free DVD rental a month NO MATTER WHAT
(ii) I get one free DVD rental after every 5 PAID rentals
(iii) On Mon - Tue - Wed, I can rent one movie, get one free.

Oh, and another thing that'll make me buy a movie - DTS!

I just got Jurassic Park 3 - not an incredible movie, but outstanding sound!!

-M-