Because the addons are likely not very achievable within 5 years of the contract eg world player of the year, premier league champions, win champions league etc.. think Levy tried something similar in the summerLopez doesnt make sense, if they want 65M why would Man Utd pay payments rising to 70/80m ?? It doesnt take a business mind to thinkt here is something strange there, why pay more for something you dont have too and the seller is asking for less .... Something isnt right there