Being blind the whole issue of browsing through bookstores doesn't apply (but I 100% agree with the article). However, I do use a bookstore when I want to pay by cash, or if I want the book immediately (I guess you could consider these services of the store).
Yesterday I went to the local Waterstones to buy an O'Reilly CD bookshelf - I wanted it before I went on holiday. But in this case the store was selling the book for £30 more than Amazon. For the first time in my life I said "no thanks" and bought it on Amazon.
This set me off thinking that the price difference depends on how expensive the book is. For most computer science books (costing about £30-£40) you're only paying about £5 for the convenience of shopping in a store. This, I am willing to pay. For non-technical books you only pay £2 or £3 more than Amazon, so I don't even think twice about buying in a store.
So, while I agree with the article, there's a bit of a moral dilemma when the amount you save is substancial.