I wondered how you feel about brick and mortar vs. online, especially in relation to new or debut authors? Is it ESSENTIAL to be in the B&N, Borders, etc. these days or is Amazon enough?
First of all I agree with OldHack's response. But I'll add to it.
I happen to have grown up in a bookstore, and so I am biased for sure, but I feel very strongly that good distribution and bookstore placement is essential to book success.
You've given one scenario, in which an internet browser sees more than a shop browser. But from my experience it is actually not quite like that. Let me give you an analogy, in which a Bookstore is represented by a physical copy of the newspaper, and Ama*on is represented by the online version of the same paper.
I have a copy of the New York Times. I look at the headlines and skim the front section. I paw through all the sections and find the ones I like (in my case, the Arts section or the book review). I read it - starting with the headline that most interests me, but because I have to flip the pages to read more of the story, I find other articles along the way. I finish that section, but I am not done with my coffee yet, so I paw through the other sections - oh that Business article looks intriguing, and while I am reading more of IT, I stumble across more things that I have an interest in, wowee! I play the crossword puzzle and munch on toast, and probably take a look at the actual news before I am done. Total time in paper-land = 30-45 minutes.
OR, I have an online version of the New York Times. I glance at all the section headings and click on the arts section. I go directly to "books" and "lists" and see if my stuff is on the bestseller list. I see if there is a review of any book I am already interested in, and if there is, I click on it. I look at the headlines only, and if one seems interesting, I click on it. I leave. Total time = 3 to 4 minutes.
Is one inherently better than another? Nah, they are both good for different reasons. The physical paper is a tactile experience - you get smell, touch sight and the act of pawing and flipping pages, as well as all the things you look at without even really realizing you are doing it. You stop, slow down, peruse, enjoy, glance, etc. The internet paper is quick and ink-free, you get what you want and you keep moving.
The same is true for physical bookstores vs online. The times that you "browse" online are when you don't know what you want, but even then, your choices are limited by what the computer THINKS YOU MIGHT LIKE based on its own internal algorithms - rather than in a bookstore, when you can look at anything, and booksellers can give you recommendations in a much more personal way.
But anyway, all that is neither here nor there. I don't think Ama*on is enough personally, I think physical store exposure is important (not only Waterstones or B&N, but also indie bookstores, and Tesco, Target, Walmart and/or Costco woundn't hurt) if you want to actually move serious paper. But whatever, prove me wrong.