I think the biggest myth around the "pure profit" idea that the likes of @Hansern seem to believe is simply that it's extra profit. It's not, it's just a timing thing. That can be beneficial or detrimental depending on results over an extended period (which are themselves very unpredictable).
If you sell a youth player for 100m then you get all that as profit in year 1.
If you sell a guy with book value of 50m and 2 years left on his deal, you get 75m in year one and 25m in year 2 (amortisation foregone). Total still 100m just accelerated.
There's really no way of knowing from that example whether you want the extra 25m in year 1 or year 2. It just depends.
Your assumption is incorrect.
My point is that although we have some well documented wiggle room now and transfer of the magnitude the Wirtz deal would be, will have to be managed in the future. Any sale isn’t irrelevant.