One point that I think is an advantage of holding several games/competitions at the state level is that small clubs in the interior may have more chances of reaching the "Serie A", for example, because if it were a competition at the national level, hardly a small team and with limited resources, he will be able to reach the Serie A of a national championship.
But that won't solve the small club's problem - lack of money.
It is true that being in "Serie A" will bring more money, but it will also have more expenses, as in longer trips.
This in turn would lower the competitive levels of "series A", which could further solidify the big clubs.
I had a colleague, who played for the amateur club, in the lower division. When we talked about what their goal was for the season, he replied that it was second. I asked why. The answer was that if they get first, they will go up in division and that will increase expenses that would cost the club more money, which would no longer be viable.
