Because he's one of our highest paid players and only has a moment of brilliance every so often. His role in the team is to be a striker not a player who links up plays, that's what we have midfielders for. Also with the amount of money he earns he should be a lot better then he is and he just does not deliver the goods. I suggest you go have a look at these players and they will show you what a striker is meant to do - Suarez, RVP, Aguero... Oh also a lad named Didier Drogba!