I do the purchase/return whenever I can. I am decorating my dining room table with fancy stuff (read => stuff I would not normally pay for) and it is looking really nice. I always purchase something I don't want first. The time between purchase and return is 15 minutes. That gives me enough time to drive to another parking spot in the shopping center, make notes on the report, then drive back and do the exchange.
So I guest I would say, that I like the shops because I have a purpose for them.
When you learn, teach, when you get, give. Maya Angelou