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They found that YouTube viewings after a series had stopped airing boosted sales but hurt rentals. Kind of odd. Sadly, the original report is only in Japanese, so kinda difficult to study. Fortunately the article is in English.
Now, anime is a specific entertainment slice, so it may not be applicable to all media categories.
http://torrentfreak.com/internet-piracy-boosts-anime-sales-study-concludes-110203/
http://yro.slashdot.org/story/11/02/04/2240221/Piracy-Boosts-Anime-Sales-Says-Japanese-Government-Study
Now, anime is a specific entertainment slice, so it may not be applicable to all media categories.
http://torrentfreak.com/internet-piracy-boosts-anime-sales-study-concludes-110203/
http://yro.slashdot.org/story/11/02/04/2240221/Piracy-Boosts-Anime-Sales-Says-Japanese-Government-Study