How to manipulate the Kindle best seller list?

From IndieReader:

Thomas Hertog claimed that, by using a few simple tricks, he’d gotten his book onto Amazon’s bestseller list. In an article titled “Amazon Kindle’s Best Seller Ranking Is Bogus,” Nick Farrell writes: “Over five months all he [Hertog] had to do was buy and download his book to his Kindle 173 times. He has also written 42 customer reviews that he voted on a hundred and eight times to raise the ranking on Amazon’s bestseller list and recommendation lists.”