Money moving down a pyramid is not charity. It is the price a top division pays for a functioning talent supply, a credible cup and clubs capable of being promoted into it.
A league that sells its matches collectively is doing something a group of independent clubs could not, and the reason has less to do with size than with what a schedule is worth as a whole.
Division size looks like a matter of tradition, but it is fixed by an arithmetic of dates, rest days and competing competitions that leaves very little room to move.
Franchise leagues and promotion pyramids are not simply different traditions. They are opposite answers to the question of who should absorb the cost of a bad season.
An open division and a closed one can look identical on a Saturday, but the trapdoor rewrites every incentive a club faces in planning, spending and squad building.