I would expect the slightly less hardcore but still somewhat interested fans to simply download these sets from the US iTunes store, which is offering them at close to half the price that official store is listing. So maybe limiting the physical 2CD release is a smart decision.
I would classify myself as a pretty hardcore and very interested fan who is more than likely going to go the iTunes way.
Why? Because I know my listening habits. CDs and vinyl sit there, digital gets played. I bought Dizzy Heights on vinyl, and while it sounds great, I never listen to it. The digital files that came with it are what gets played. Why waste money?