Why is Neymar's price relevant to Suarez?
Barca corruptly spent a bomb on potential, potential which he didn't come close to fulfilling last season. Now they're spending a bomb on a player in his prime, world class already, 3rd best player in the world. Obviously there'll always be that cloud hanging over his head that he could be seconds away from getting himself banned again, but that's just a caveat you have to accept if you want his quality in the team.
If either of them is overpriced, it's Neymar, and if Suarez is overpriced, it's because they overpaid for Neymar and continued with the other megaclubs to drive transfer fees through the roof. This is the bed they helped to make.
Suarez will win them the league as well, even if that money would obviously be better spent on 2 centrebacks and a rightback.