I believe the OP was specifically targeting agressive sales staff:
where one is bombarded with salespersons hawking free samples of perfume/food/whatever. I'm polite (mostly) but after a few "No thankyou's" and finding one's forward passage continually impeded by shoppers, sorry, travellers who DO want to go shopping, the stress levels started to rise.
Airports need to make the experience less stressful, not add to it.