One problem could also be that rich teams generally have the problem to get good players cheaper because the other teams know how rich those teams are. It's like a premium they have to pay for any player they want.
But yes, the transfer of Lukaku at that amount was clearly wrong, but there are many transfers that have been clearly wrong. One great example also is Joao Felix. Those numbers are out of this world and many of the players have never lived up to that. But I think the clubs which received the money don't care right?
If the transfer that occurs to As Roman in bringing in Lukaku doesn't seem to be a problem, but it's different from the capacity in his game will it match management's expectations and coupled with Jose Mourinho's scheme, it is likely to be able to compete with other attackers, what we know is that As Roma has enough attackers good and hungry for goals like, Andrea Belotti, Stephan El Shaarawy, Paulo Dybala, Tammy Abraham, even though it's not visible yet at least we can see in the next match whether Lukaku will be useful for As Roma or will perform badly..