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..
I am following the game against AC Milan at the moment and I have to say this is bad for Roma. AC Milan is dominating them in every respect. I thought this is rather an even game between the two teams and Roma would at least try to play their own game and set Milan under pressure, but that's not happening at all. When you look at the statistics you would immediately think that Milan is playing the home game and not Roma. With the fans supporting them, Mourinho as the coach and lots of time to prepare for this game, this is quite a disappointment situation for them. Maybe Mourinho is already regretting that he turned down the offer from the Saudi club.