Linked Items: A real issue!

Why is everything in this game linked? Some for 2 months 3 months 4 months some for 1 year!?
Why is this so necessary? Biggest reason I'm guessing is to stop overflow or delay it at best?
But this holds no real purpose. After the link is removed overflow occurs anyway.
For Dofus eggs this makes even less sense. The Dofus eggs flow through different hands all the time.
There cant be any real overflow issue.

So is this linking mechanism meant to make you play until your item is tradeable?
Is it really a way to control you? I think the linking mechanism should be removed.
Or at the very least the duration be reduced to 1 month maximum.

Please tell me your thoughts below. If you have a counter argument feel free to post it just keep it friendly