Yes more then worth it, you make precedence that no contractual terms or no agreement is final before documents are signed, making it possible to continually making demands even two seconds before the signature.If another player with same or similar profile is going cost an extra 5 million, is it really worth not closing over? Just to draw a line in the sand?
I would take a Utilitarian Approach to this.
You need to stand firm when agreement’s been reached, they agreed on the contractual terms meaning it is binding and no additional negotiation can be made as it’s conclusive.
Even if it’s a €100 it would be worth it just for the principles in it.
His entourage can just f*ck off and so can he, don’t want too see him ever wearing our jersey with that sort of mentality… Juve is a more suitable place for the kind of person