currently I would personally say we are a Regional based league.
The structure is set up like college sports..
You play in your local field (Section) for the regular season.
STep 2- Play a single elimination Sectionals event where the top two win cash and the top three move on to regionals.
Step 3- Regionals is where teams from two or three fields/sections compete for cash (top two win cash and top three advance to what we currently call nationals)
Step 4 - nationals/finals top three win cash/prizes
Our visions is to have more than two regions but currently we only have two regions to which we work with.
I do hope this was helpful.