For every transfer fit, there is an equal and opposite transfer flop. This is the law of the market.
From 1992 through 2021, just 54% of all the players brought in for €10 million or more by Premier League clubs started at least 50% of the matches in their first two seasons. Raise the fee threshold up to €20 million, and it doesn't get much better: More than 40% of the players still fail to reach that 50% mark.
Per a recent analysis from The Times of London, Premier League clubs made 370 signings for the past season.