What are you grumbling about- the shops are nice and expensive looking and glossy! True, it's not what you are at the airport for, and the 'fantastic savings' are largely illusory, but aren't they lit attractively?
As most people travelling are in time crisis mode after being subject to the dreadful security procedures, the shops could well be dispensed with, but presumably the concessions make a fortune for BAA.
We have to examine the whole question of....BAA....why? The original owners got it into the state it is in now. They desperately sold to someone.....anyone!......handing over the keys with deep joy. With the thought 'I can't run it, here are the keys, you try!'. Telling Ferrovial 'well, it's a good runner. Might be a lot of smoke when you start up, but it's OK!' Meanwhile Ferrovial have presumably discovered what a bad runner it is. And deep down, they now know what the seller knew....it cannot go on as it is- it is going to fall apart and be dismembered.