There's plenty of AAAA schools playing against schools twice their size. Enrollment does matter in every sport simply because the larger the school, the greater the pool to choose from. The odds are that you'll get more good players than a small school. Location is also quite important. Rural schools, regardless of size, will likely do worse than urban or suburban schools in a sport like soccer. In our state, soccer is still viewed as a "rich kid" sport by the majority.