I know from personal the experience the reason why I peruse a book store and then buy from Amazon is simply the price. Having it available instantly instead of waiting the 3 - 5 shipping turn around is nice and all, but it isn't worth a markup of almost 25 - 40% over what I pay on Amazon.

I love book stores, and there have been quite a few that I've been to where I've found books that Amazon simply didn't have and bought them, but overall the price is too great of a difference to simply ignore.