Bro Napoli and inter Milan spending much in the transfer market means nothing, yes they have spent and sign good players but non of them are toping the league, so you never can tell, like you might be surprise that unexpected team from that league will win the trophy, and don't forget Juventus is out for business this time around so don't be so quick in conclusion as the league is still fresh.
How would you say that both AC Milan and Juventus getting quality players means nothing? Juventus have gotten six points in two games which shows that they are one of the contenders for the Serie A trophy. They also showed that they have a balanced team since they have scored three goals and have not conceded any. AC Milan might not be at their best in two games since they lost one against the underrated Cremonese. I didn't expect them to lose in the game with Cremonese but La Cremo has proved to be a strong underdog that has the potential of beating any club.
The League is still fresh with each club playing just two games. The new players that have been signed by both sides need some time to blend with the other players. After playing more games, it will be clear that buying quality players is important to all clubs.