I mean transfermarkt is literally completely meaningless when it comes to valuing a player. It’s based on comments people post on their forums.

Here’s some examples of the standard of those voting on Mason Mount.

Performance-wise this value is not justified. He is young und has had a good credit in the past but the recent struggles justify a lower value.

Sorry Mason you did th wrong choice of team

very useless since 2021

These are your experts.

https://www.transfermarkt.com/mount-mason-60-mil-euro-manchester-united-fc-/thread/forum/357/thread_id/2224