Mentioned this earlier. The foreign quotas really ensured financial clout was not everything. You could play 2 from abroad, i.e. no more than 36 foreign players in the entire Serie A, so they were the very best.
In other countries player quotas were being filled with the very best as well, which kept above average players across Europe in their domestic leagues. That is, for the other 9 roles you had the entire pool of Italian players. Then being local/homegrown/loyal, etc. made sure they were spread around evenly.
Sure, financial power still gave you a better chance to get more of the local and foreign stars, but it was very difficult to just hoard all the talent. Just imagine the EPL right now if suddenly all teams could only keep 2 players from beyond the Home Nations (add Ireland just to keep it a bit more feasible). The top sides would get significantly depleted, the overall quality would drop (it's a much worse domestic pool than Italy had in the 80s!), but the league would be infinitely more competitive.