Netflix uses pirate sites to determine what TV shows to buy and offer

"This week Netflix rolled out its service in the Netherlands and the company’s Vice President of Content Acquisition, Kelly Merryman, says that their offering is partly based on what shows do well on BitTorrent networks and other pirate sites.
“With the purchase of series, we look at what does well on piracy sites,” Merryman told Tweakers.
One of the shows that Netflix acquired the rights to in the Netherlands is Prison Break, since it is heavily pirated locally. “Prison Break is exceptionally popular on piracy sites,” Merryman says."

Source:  TorrentFreak, 14th September 2013