Re: don't worry, our ads aren't as effective as we told you
As bright and wonderful as we all like to think we are it (the arrangement of shops) does work.
This is why I (and many others I suspect) can't step foot in a tesco (or similar) without a 30-50 quid minimum spend. Regardless of what you go in for you double up with "ooh BOGOF" and the various things on the end of the rows on offer.
It's not coincidence that the bottles of whisky and gin that have enough money off them to tempt you, are the one's you'll see even if you don't travel to the booze aisles.