Hasn't the Vader/rebel set only been repacked once thus far? IIRC after the original TAC release, that set only had deco changes that came in later TAC case revisions.
I think there have been at least two. The first version came with mostly black vader. Then there was a TAC repack in a later wave with bluish aps on the Vader. And now we have a second repack in the Legacy packaging.
Personally, I don't think that pack is the problem. Just like the Han Trooper/Chewie and Luke/R2 packs, these seem to sell thru eventually, at least around me. There's always some residual demand for these core characters, so I don't mind a repack of these guys every 3-4 waves.
I also don'tsubscribe to the theory that EU figures are not in demand. They have sold well in previous waves and the price of the comic packs is still pretty fair at $13 in most places. There's a lot of interest in the upcoming basic figure EU wave, so there's obviously some demand out there. I don't even mind the goofy comic paint jobs (blue shading on stormtroopers with red eyes?), but maybe that has hurt demand among some collectors.
Personally, I blame the poor sales on the timing/distribution of the cases and the sheer number of repacks out there. The latest wave has just three new sets of figures versus 5 repacks. The repacks are not core characters, so I can see where these might be pilingup fast in some areas. That mix of figures makes no sense to me - there are still people in MN that are having trouble finding the latest 3 figs.
The other issue is timing. I have two Wal-Marts near me that have only recently re-stocked with old cases of the Tobbi/Leia/Fenn/Dengar wave. One store got two cases of them within the last couple months - how are they ever going to push through 16 old packs that have been available for a year already? I'm not sure if this a Wal-Mart DC issue or Hasbro shipping this stuff late, but seems like an average individual store shouldn't be getting more than 2-4 cases of the same stuff.
Be it demand or distribution, having the same old stuff on the pegs for a year or so is going to hurt the line. I really like all of the new CPs shown thus far and will still be picking up 2x of each...assuming I ever see them.