I don't buy DVDs unless I already like the media, such as Dragon Ball or Avatar TLA. Even then, Dragon Ball does not have great home releases, so I tend to watch that using better quality releases available online.
Same goes for games as well, but I buy less physical media in general nowadays. I'm usually content playing everything using ODEs, flashcarts, or emulation without worrying that a disc might rot or fail. It helps to save up storage space for me, too.