That's a big part of it, yes. Retailers take advantage of information assymetry after all. While you're in Best buy, you may pay more than online to walk out with an item, but would you pay more if you could instantly confirm it's at Walmart next door for $20 less? Maybe not.

Funnily enough though Best Buy loved us and provided real time data via API and daily CSV data dumps just for us. They were like that, along with Toys R Us and AutoZone. Most others hated us, including Guitar Center after we accidentally DDOSed their web site with our scrapers.