I agree that Donnarumma's asking price isn't excessive, but it's unreasonable to ask for such a high sum for a player whose contract expires at the end of the year. Furthermore, Paris Saint-Germain doesn't seem to be making much of a bid to renew his contract. If it were me, I'd pay him the money he wants and keep him, as he's a goalkeeper whose contribution to the team has always been top-notch.
There are many players who have a fairly high market price but if you see their appearance is not so comparable to the price. Donnarumma has done the best in Paris Saint-Germain and its contribution to the team is seen more clearly last season, with some of the success achieved by the team and the achievements of the individual, so that the price requested by Paris Saint-Germain for the team who want it at this time should not be too expensive. The contract problem will be detrimental to PSG but for other teams it should not be a problem regarding the price with the quality shown by Donnarumma.