This is of course a completely different discussion but one worth having.
The market is so fucked now that players are going for transfer fees (and wages) that they are never going to be able to live up to. Semenyo in this case is a perfectly good Premier League player. But if he is sold for 70 mil he is never going to live up to those types of expectations. Those types of players are still very much rare.
Or Solanke for a more close to home example. There are people that have labelled him a flop because he cost a lot of money. And this is in spite of him scoring 16 goals in all competitions and providing 8 assists. He's a good forward but people turn their nose up because they expect numbers that he is probably never going to provide. Not to mention that he lives in the shadow of one Harry Kane.
The point I am rambingly trying to make is that the prices paid in the current market are screwing players, clubs and fans over in some way. Shave 10-20 mil off of the Solanke fee and he would not be listed as a flop at all. But the inflation in the market has shattered what is considered reasonable.