So like I said: Buy a few marquee signings, but invest smartly in some talented, albeit lesser known, players as well.
Most supposed smart signings end up being average players in the end tho.
How many "verratti" did happen?
PSG bought him 11-12M IIRC, and now only god knows how much he does worth.
People complain that Pogba worths supposedly 100M but no one knows how much PSG would ask since Verratti - as opposed to Pogba - is not for sale.
In the end, Marquee signings are smart signings when you really need to replace some players like Xavi or even Inesta soon enough.
Smart signings of lesser know players are a gamble that you should avoid unless you're really really really sure that it will turn out great.
For example, I still think that Suarez was a good signing in the end despite what I said about my fears that he might bite someone again. I would not swap him with any "lesser know" players even if it would cost only 1/3 of what barca paid for suarez.