Ozil and Arsenal are fighting a war not based on value but price but why?

Mesut Özil is a German professional footballer who plays for Premier League club Arsenal as an attacking midfielder, but can also be deployed as a winger. He is renowned for his technical skills and creativity; due to his agility, finesse and versatility as an attacking midfielder. 

Arsenal Football Club is a professional football club based in Islington, London, England, that plays in the Premier League, the top flight of English football.

Антон Зайцев, CC BY-SA 3.0 GFDL, via Wikimedia Commons