It's also needed 3D glasses (which are expensively ridiculous).
All this started when Sony went on promoting their new 3DTV's trying to prove that they're better than HDTV's while it isn't true.
But dude it's 3D!! So? Do you think I want to watch videos or play using glasses even if I don't need? No. Then there's my answer.
3DTV's not worth it.