I wanted to add that I think a lot of people on here tend to forget that there are a lot of schools where enrollment is under a 1,000 kids (heck, around here, there are three with enrollments under 40 kids). The talent pool isn't nearly as deep.
Edit: Our school (enrollment around 615) is by far the largest within 60 miles in any direction. There are five other schools within that range, none with enrollments over 100 students. Two of those schools play 8-man football and the other three play 6-man football. Two of those schools combine to make one 2A baseball team because they don't have enough players in either school to field a team alone. Strangely, though, they have enough for football.