I don't necessarily agree with City Centre's policy but, just for a second, let's analyse this from their perspective.

There are two types of people who would come to the mall: the ones with purchasing power and the ones with no purchasing power. The latter group wants to come in ot the mall to chill out in cool air whilst the first group wants to make purchases. If the mall is too full because of the group who will not make a lot of purchases simply because they can't afford it, the other group may not go to that mall to actually spend money - and making money is the driving force for any business establishment.

I think it is quite understandable. Not fair, but understandable.