What a funny place is the transfermarket on football, is just incredible how anyone can cost a fortune but a high level and top 3 goalkeeper of the world like Donnaruma is gonna cost Manchester City only 30 millions euros, i know this transfer have some special things about and time was running, but come on is just crazy to see any other goalkeeper being much more expensive.
The crucial point here is that Donnarumma's contract expires very soon. Therefore, transfer fees that seem reasonable to us are considered normal for these transfers. Of course, I don't think it's unreasonable for some Premier League teams to pay €90 million for newly announced players. Perhaps transfer fees in football need to be restructured.