I know Coach Rod, and Coach Mac. They aren't recruiting the area for players. They don't need to and I doubt they want to. There are not tons of transfers of older kids. Yes there are a few here and there but it's not as if Webb City is assembling these all-star teams, poaching varsity and jv starters from Carthage or Joplin or wherever.
What does happen is lots, and I mean LOTS of families move to Webb City when they have kids or their kids start school or when they are new to the area entirely. Which is, IMO, why they never seem to run out of very coachable, highly invested kids/parents on their rosters.
You pair that with good coaches and it's a recipe to win an awful lot of games. It's not complicated and it's not scandalous but it is very difficult to replicate.