Different prices for Different areas / Class

So I get onto my Ster Kinekor app yesterday and check out prices of a movie I wanted to see last night. I usually book via the app, and have a Edgars Movie card so I dont really look at the prices, but last night I actually took note. A 2D movie playing at Cavendish is R84.00, with Edgars discount is R48.00, Blue Route mall is R82.00, with the Edgars Discount it is R44.00, the same movie playing at N1City Mall is R53.00, with the discount R29.00. I called the Ster Kinekor booking line, and they couldnt answer me. Why are the prices different in different areas? What is Ster Kinekor trying to say? I have to drive 16km to get to N1, instead of 8km to Blue Route if I want to pay my discounted prices (mind you, Edgars Club is also a monthly fee)