Trust me, they don't.
You may have room to manoeuvre in the structuring of a deal (up front vs installments; guaranteed vs conditional add-ons; sell-on percentage etc), but the bottom line will remain unchanged. Essentially this is because since Benham took over (a decade ago?), he has never let the club get into a position whereby we have had to sell a player on the cheap due to finances dictating that we must.
Nor do we box ourselves in by setting unrealistically high asking prices.
And since transfer revenues from the last 18 months have been ahead of budget targets, and NM is under contract until 2021, we can hold this line more strongly than ever.
Which is not to say we'll keep him (it's possible, though extremely unlikely imo).
But if/when he does go, I'm v.confident we'll get our price.