I must disagree. first of all, the difference in video quality between dvd and bluray is very significant. consider:
DVD = 640x480 pixels = 307,200 total pixels
Bluray = 1920x1080 pixels = 2,073,600 total pixels
this means that bluray has roughly 6.5x the resolution of dvd. Whether you _need_ this many pixels is up to you.
Also, something that a lot of people don't seem to consider is that this format war was about more than just movies. As you can see with dvd and cd, optical disks are used for more than just movies and the same is true of bluray. once prices go down, bluray burners will become a default part of computers. As far as I know, you can back up data on them. So, aren't you glad that bluray won since its maximum capacity is 50gb vs the 30gb capacity of hd-dvd? i heard that it would be possible to make bluray disks that hold 200gb, which is even better. If they start making 200gb bluray blank media, you might be able to back up your entire pr0n collection to one disk!
like my dad used to tell me, "Think before you speak!"