The point of sport is to play it. All of these structures are created to give sport meaning beyond playing with family and/or mates in someone's back yard. Given that, my general view is that the most important metrics are numbers of players and numbers of games, basically. Other metrics still have importance for other good reasons like sustainability, but those are the top 2.
For organised competition of some sort, the main reason to create clubs is to organise that competition. If there are enough clubs within travelling distance, those clubs start to want inter-club competition (especially in team sports), so bodies are created to organise those. Then people think bigger and start organising rep sports nationally as a national championship, and now you need a national body.
For tax purposes, the point of most pro sport in NZ is to fund amateur sport. The main reason to charge bigger fees is to pay staff/contractors when your club/PU etc is too big for volunteers to be willing to do the work, or they aren't up to it.