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Depending on your site traffic, how targeted that traffic is for the book or books you'll have on your site, how much content exists for each book (you have to put them in a buying mood to click that amazon link), your mileage may vary greatly. Over on the amazon discussion boards, the general rule appears to be to make one sale through amazon for every 1000 visitors to your site.
It's much more likely that you will make sales by showcasing products directly related to content on your site. People come to your site, read the content, and then decide they need the product that you are showing. It's very easy for them to click the link and buy in just a few clicks instead of going to amazon dot come themselves and searching.
...I was thinking about selling specific books directly related to the suject covered. ie travel website. info on moving to that country... book for sale on amazon about moving to that country. info on setting up a company there - book about that etc...
I have done this with my travel sites (enhanced product displays). I have sold a *few* books this way - not enough to get me all excited about a few sales, but the books help to dress up my pages with a splash of color without hunting for photos.
You might want to look into AllPosters.com for another product line to add to your pages.
I found that someone even ordered a Segway thru my site once in the very early days of that device's introduction. It was subject to the Amazon 'cap' of something like $25 or whatever, but I was thrilled they used me for order.