With the film in every IMAX theater a lot of the gross is inflated from tickets that run $30-50 vs the usual $15 ticket price.
7.5 million bought tickets this past weekend to the Odyssey. Those IMAX theaters are there every weekend. There is always a movie benefiting from the higher ticket amounts for the last 20 years or more. Movie goers seek them out since it is a better experience.
It actually speaks well of a movie that one will pay more to see it when right next door, it is $10 cheaper or more.
In two weeks, Spiderman will be in many of those theaters. If you google, you can see exactly how much money is generated based on type of screen.