Spending big for the sake of capturing the best players on the market is not always the best strategy.
Big players demand big stages. Even if you were able to sign such players at an early stage, they would soon come to you demanding a transfer if they feel that the club is not big enough for them.
Even the best players need time to adapt to a new team. The last thing you want is for them to turn around and demand a transfer as soon as they start fitting into the side. To make things worse, refusing the request will further reduce the affection they have for the club to the point they will become a liability.
So, when you try to sign a big name, just make sure that you are fully aware of the risks