The EyeToy is valid because it had a respectable success... for example EyeToy Play sold near 4M on PS2... so 4M of EyeToy sold just with it.
This is just one game.
By the end of 2008 EyeToy sold over 10.5 million units for PS2 only... I guess a success.
In-Depth: Eye To Eye - The History Of EyeToy
So... I'd better search before talking that a product was not a success.
If Kinect or Move sold more than 10M this generation... I would say it was a success.







