In an earlier post, I suggested reasons why bookstore owners might want to break an embargo on the release date.
I thought I should get back to the topic and explain why the embargo is actually important. Essentially, the embargo helps small and independent bookstores. When a bestseller is released, distributors typically deliver books to the largest stores first. If there is no embargo, those stores can get the books on the shelves before the independents have even received their copies - and those smaller stores may have to wait days before they get their copies, by which time, the market could be considerably reduced. Even more damage can be done by customers going to the independents asking for the books and not being able to buy them. Those customers then get the impression that independents simply can't stock the books the customers want to buy. This loss of faith in the independents is catastrophic for their business.
After considerable lobbying, independents have been able to secure embargoes to prevent the larger stores gaining a competitive advantage purely due to their size and the preference of distributors to deal with large quantities.
So the embargo really is a big deal. Independent bookstores are one of the last bastions of good and diverse literature and do need to be protected. (I'm not saying all large bookstores are evil - just that by their nature, they are unable to stock many of the titles that discerning readers may find valuable.)
I spoke with some independent bookstore owners today and they are very disappointed with the independent that sold me my copy of HP5 - they think that bookkeeper should have known better and is doing the industry a disservice.
As such, I am sticking to my guns in not revealing the location of the bookstore that sold me the copy and I am also not revealing specific plot elements.