It's like people who watches sports but don't do any.

Edit: Well. after a few minutes of reflection, I wanna contribute with my two cents and say that it's pretty common to do this kind of thing of watch videos instead of playing games, but it is done under very specific circumstances, like, I am a SFIII 3rd Strike player and I have a job to, so, I can't be playing all the day. Competitive players need to be being in contact with the game that they wanna master to not get rusty faster, so watch videos is a way of getting that contact, view plays and movements and get that in your head till the moment you got a fightstick in your hands to be able to put in practice all those toughs