Well.....my name is
Mad Hattered.

I didn't mean to ruffle your feathers. I guess it was this part of your reply that prompted my response:
"As they say, there are lies, d*** lies, and then there are statistics.
I can make multiple arguments for these numbers on every side of the argument."
The point being, since Disney won't release that data to the general public there is no possible way know the real answer. So you can't make multiple arguments to support why HS studios had nearly 8 million less gate clicks than MK.
Edit - In 2012 the WDW parks saw an average of 2.23% growth whereas Universal saw 3.25% and that was 2 years after Potter came to town the first time. If that trend continues then it is VERY conceivable that once Diagon Alley opens in 2014 that they could surpass one of the lesser-visited parks. in the near future.(IMO)