knowing that expensive often doesn't equal great, comes with experience (of the management) ... sometimes to get quality you need to spend (Ibra, Nesta, Pippo) but Milan build a midfield, which dominated Europe for years under Carlo with other team's rejects (Seedorf, Pirlo) or little known players (Kaka, Gattuso).
in the end of the day, a champion is determined by his character, not by his price-tag.