well... think of this. If you would like to find information about a particular book, would it be natural to go to Amazon and find the description, reviews, etc. about that book? And the reason why it become natural is because the page for that product/book has a valuable information.
I guess it should be the same in your case, I would hope that you are not going to place only a single "buy now" button, but also other "helpful" information about that product.
Hope that helps 
