I am not a fan of a lot of the marketing plans advocated by vanity presses or author services companies that require the author to pay a large fee to have the contracted company send out a mass e-mail trying to get individuals to all purchase a copy of the author's book from Amazon on a specific day to cause a peek in Amazon sales. All this in a effort to be able to claim Amazon Bestseller status will cost a lot of money and the resulting atmospheric Amazon Sales Ranking can vanish just as quickly as it was created.
Having said that, you might want to visit this blog. It tells the story of how a self-published book hit #2 on Amazon for a day with a variation on this approach that was NOT about achieving a specific Amazon sales rank status. Instead it was about energizing the potential fans of this book about being excited to purchase a copy! A unique and different approach with the reader in mind. Something to think about.