I think there are not many teams that are rich in any league. Most of the teams are in debt although I don't know how bad it is in Italy relative to other leagues, but Barcelona and Madrid are also said to have huge debt. Those teams who have big investors don't suffer from those issues. But I often wonder how these clubs always survive their financial problems. I have never seen a club go broke so far in one of the top leagues.
I think the easiest way to put it is that Italian league is filled up with manipulators lol. EVERY transfer window; they never have the funds to buy players, but they request exorbitant fees when they sell players same summer. Yet they wonder why no investors or agent market their players to the league lol. I think the league should improve on their marketing approach especially tv broadcast fees so that the teams in the league are able to compete well