For reason "a" that you mention above. The folks that will buy this are the more hard core fans that specifically want the original release, or people buying it for a hard core fan as a gift.

Claiming it as a limited edition raises the price. Two disk sets (even though many will already have the other box) will also raise the price. Releasing the movies individually instead of as a box will raise the price some more. Especially when your target audience is the "collect the whole set" crowd. Especially when you claim that it is actually inferior to the revisionist set and slap a "classic", "nostalgia" or "retrospective" label on it. More collector value, raise the price...