I see double dipped DVD's as a way to please both hardcore fans of said movie and just normal fans alike. The normal fan will buy the movie thinking "Cool, I've got Fellowship of the Ring on DVD", while the hardcore DVD enthusiast will say "FARKING COOL! I've got THIS tasty nugget to tide me over until the Extended version comes out in 6 months!"
I think it's a win-win situation.
Yes, I've been pissed that some of my movies I bought on the day they were originally released on DVD, now have a Special Edition out, but if I wanted it THAT bad, I'd buck up the extra $20 and have both flavors.
It just depends how into movies that you are, I guess.
A more recent example is the Matrix movies. Revolutions just came out today, and I went to Best Buy and got mine with a 3rd collectors CD ROM with a buncha extra nifties on it. I know for a FACT that there will be a box set coming out sometime in the next year. Will it just be the 3 currently in store versions, boxed in a pretty box, or will it be a Trilogy set with so many extras that I'm gonna whet my pants when I see it in stores? I've already got the 3 on DVD, so I probably won't buy the box set, unless there's something mega cool on it.
On the flipside, I don't own any of the LOTR movies, so maybe if a box set comes out, I'll drop the $100 or so that I know it'll cost and get them all in an uber 12~15 DVD set. Who knows. It's all up to your interest level in said movies.
