I personally think this is a slap to the face for everyone that bought the game the day it was released. You are telling me that the only way to get the HOTH level is to buy the whole game again? That's insane. They should release a patch to make the regular edition into the Sith Edition, giving us the chance to pay for the content offered exclusively on the Sith Edition as DLC. I liked the original game but waited patiently for a patch to fix some of the issues with the game and it never came. Now, they are telling me a loyal fan, that the version I have is basically obsolete, and that I have to buy a new version. Personally if this is the case, I won't buy any games from LucasArts anymore, or I will wait until they release a second edition of each game before purchasing them.
I wish I had a Kryptonite cross, because then you could keep both Dracula AND Superman away.