"Touch-Point Marketing". Shopping is impulsive. I can tell you as a young female, I love nothing more than walking into a store with a cup of coffee and my phone and spending hours browsing. It is a social activity, a hobby almost. Shopping with friends? Nothing better. Also, smells and sounds are HUGE in marketing and online shopping doesn't offer that subliminal influence.
There is nothing like fingering through racks of clothes or walking through rows of pretty silverware, test driving a fast car, playing around on a cell phone you might want. It's simple.