I have recently discovered a good blog about ereader news. There have been several interesting articles, but one that caught me by surprise was post about services that allow you (for a price) to buy your way onto the New York Times and Wall Street Journal Best Seller lists. it is not cheap, the service essentially buys your book in really large quantities gets you on the lists and then returns or resells your book.
According to a Wall Street Journal article that is cited several books have had 99% drops in sales the week after getting on the list because they paid to be on the list.
I have the same response that the blogger that wrote the article, the best recommendations are word of mouth or real people like Goodreads.