Where do you expect your players to come from?
It's quite rare for clubs at the proverbial "top table" to buy players from each other.
They very often come from "mid table clubs or leagues that are a lower standard". It's why the best clubs invest so heavily in their scouting departments.
The difference is our players pretty much without exception have never showed themselves to be any better than they are now, there's no reason to think they'll be world beaters. Just a bunch of kids with potential. They might develop but it's not looking too likely so far bar a couple of players...
Quite often players come from lesser teams in the CL, or similar where they've at least stood out, or dominated a lesser league at least. Salah from Basel for example (he was class when he played against us), Hazard from Lille, or Kante from a title winning Leicester team. Even Bakayoko was in the CL team of the year when we signed him (yes lol). If you go back through our transfers all the way to Drogba, Essien, through Meireles, Fabregas and many others. There was legitimate hope these would be world class players or they'd already showed they were class at the top level.
Just to take a couple of the most expensive examples from Clearlakes business, Enzo had 17 games in the Portuguese league before joining us. Sure he got carried to a world cup title by Messi and the refs in Qatar. Then we spend €121m on him (plus addons I think?).
Caicedo had 45 PL games for Brighton, with zero appearances in Europe or any significant international football either. We then spent €116m (Plus addons?)...
Can pretty much go through the squad like that. Overpaying for potential that may never be realised.
The two players who have worked out, Palmer and Gusto both came in for reasonably sane fees. Palmer showed some glimpses at City and had scored a few goals at PL level, £45m is expensive but given his age and City pedigree has been decent value. Gusto was much less at €35m, again paying for potential largely but it's not €100m+ like the examples above.