This is what i call Nocerino-Muntari syndrome*. Tons of talented players are available at quite affordable prices, but some delude themself into thinking we can sell a Krunic for 15m.
Yeah, average players can do good in functioning teams, that's why midtable teams with great chemistry can be scary af. It's ok having a few, but that doesn't mean anyone would pay that sum for Krunic. Krunic-level teams will find their own Krunic-type for much cheaper.
*I have memories of people saying something like "oh yeah, we can sell Muntari, Nocerino and Poli for 5m each and buy a great talent for 15m".