Because millions of people on the internet don't directly link to YouTube videos. If they really wanted to stop direct linking, I think they would, as it's not altogether too hard to set up a referal-checking script. And sites like Digg that direct link to dozens of videos A DAY would remove the entire site in a matter of months.
Maybe it draws attention, but I don't overly think they care because it works.
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It's not that I don't like you. I'm just direct.
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