He was never a prolific player to command such a fee, at most he is £70m and that's with his physical presence and pace and supposed potential. His finishing is actually poor and wastes a lot of shots from distance. If you look at his stats he has these impressive number of shots from distance but only several goals per season come off them. His accuracy rate is below 40% for every season, the last being 37%. If anything, he wastes a lot of chances and affects players around him, but at Juve it's not like they get tested in their league.