When was the last time you walked into a retail store and when you picked up your merchandise and went to pay for it at the register. The merchandises "vendor" popped out of the floor and said, "Psss, hey pay me here, and I will charge you less for that item!" And the "store" was OK with that?
I'll wait.
Online shopping.
Customers have the choice to buy same thing through other channels. Leave the store and search for better purchase. Of course customers can choose to not to go anywhere else and complete the purchase. To make this happen, iOS would need to open up and allow other ways to install the apps.
Your vendor popping out example is a bit over the top.
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