This question came up when I bought a used copy of
The Fifth Element: Ultimate Edition last weekend. I got the movie when it came out on VHS , then DVD when formats changed. Since DVDs (in most cases) come loaded with extra features, it isn't so bad to purchase them again. Unfortunately, the original copy of The Fifth Element had none, but the ultimate edition has two discs, the second starting with a featurette about the production designers
Mezieres and
Moebius, so to me it was worth buying again.
But my question is why didn't they put this out in the beginning?
The eighties saw not only the birth of the compact disc, it also saw most of us buying music we already had on vinyl records or tape. Since the format was superior I didn't mind, but it did annoy me when The Beatles finally came out on CD. It would have been easy to add the singles to the albums, such as Rain and Paperback Writer to Revolver, or Day Tripper and Drive My Car to Rubber Soul. Those albums made more than enough money in the past, they could have given us something extra, instead of putting out the same thing at full price. Of course annoyed or not, I ended up buying those as well. It seems it's the
form we are paying for.
So, one copy is all you need, as long as it was done right the first time.