IMAX will always be limited by the number of seats available qn the first weekend. All they can do is sell out.
That's the problem with these one or two weeker's. What we really need is a "must see it in IMAX" reccomendation which will get us into the second and third weekend. "Avatar" lasted for 13 weeks on the strenght of such recs like the one that came from Oprah. With the next 2 movies we only have to get 3 to 4 weeks on these movies.