You don't understand the context. Nobody will buy Rugani and even if someone does, it will be shit cash, he's not worth that much. You can only sell if there are buyers.
I'm not happy myself that Demiral is being sold but I predicted it months ago - he's an easy plusvalenza, it's hard to find an easier one in this squad.
Besides, he wants to be a starter, Rugani won't bitch about sitting on the bench. It makes a lot of difference.
My assumption is that we'd never sell him if it wasn't for books being red from top to bottom.