I only buy a CD if I really like the album, or if I like moderately well but love the artwork. U2 and Simple Minds, for example, I wouldn't think twice about buying the CD. Enigma is one where I buy them also for the artwork - their album art is awesome.
DVDs, what isn't available on Netflix that I really like, I'll buy it on DVD.
A lot of my entertainment is digital, though; and in recent months I've liquidated a lot of my hard-copy music on eBay..