From the store's point of view though they won't sell it at the same price you get online because they need to pay for location, staff, deal with shoplifters and books that go stale and unsold that need to be taken off the shelves again.
I have had the same experience with Barnes and Noble where the same book is listed as cheaper on their website than it is in person.
I find it just a little dishonest because in general you assume that if you visit the website of a store that the price listed on the website will match what you will pay in the store. I don't think they would "open pandora's box" if they changed this policy, though I suspect that they maintain it to have it both ways: beating Amazon on price online and charging whatever they want in the store. When those two collide I'd bet the majority of people just suck it up and buy it at the retail price because they already drove out to Barnes and Noble.