I don't know - personally I don't think price is the issue with Gundam. Sure, maybe it'd sell a few more copies at a lower cost, but personally I think the price it's been sold at is very reasonable for the number of episodes you get.
Being a big Gundam fan, the unfortunate truth imo is that UC Gundam just isn't *popular* en masse in the West - it's a niche within the already existing niche of anime itself. It's old, it's retro - to most people, it looks dated. And any of the other UC shows set after that will probably sell less. The only Gundam shows I can really imagine selling more are Iron Blooded Orphans, Wing and SEED.
On another note, I think Princess Arete is a really strong pick for Anime Ltd - very much in the line of the kind of film I expect them to pick up. I caught it at the Japan Foundation earlier this year and it's really good - perhaps a tad on the long side and probably one of the slowest paced things I've ever seen, but it has an interesting aesthetic and very much an art-house feel to it.