At the end of a 36 or 60 month lease, almost all A4 MFPs have zero value.
When A4 product comes back they often cost about the same to refurbish as to buy new.
This brings up the question of how to dispose of them.
A4 product is largely plastic so there is not a lot of metal to recycle.
Usually they become electronic waste and potentially dumped in a landfill which increasingly is being recognized as bad for the environment.
A3 copiers by comparison have some value when used and can have at least two productive copier lives in many workplaces. There is some metal in most of them so you can dispose of them at select metal recyclers.
Plus you can make some really good money selling used A3 product.