Big clubs don't do this. And it would mean we are seen as a stepping stone.
I don't care if it's 100, 150 or 200m, we should NOT agree to this. Juve is not Napoli or Torino.
But when the time comes to show power to retain him, we lack the funds the big 3 have.
Traditionally, we are as big as Barcelona, madrid and Bayern... but in sheer economical power we are behind. Thats why we cant simply say "no clause, you are juvebound".
There are really big offers outside of italy. We can talk as much as we want of how great Juve is... but if other teams show Dybala stupid offers, we need to do the same to show him we are able to compete. If this requirement is not met, he needs to make it sure to add a clause in case a better offer arrives and he is willing to listen. Otherwise he would close doors just for the sake of the "spirito juve".
He can like being here, but if in a couple years he grows even bigger and clubs come doubling his salary , he MUST consider those offers. No one can force him to stay here,and if we force him, is because we have the spending power to simply say no and up his salary.