Every collegiate conference is regional. [0] Long flights are expensive and inconvenient. You could maybe justify a national conference for men's basketball, bu

Every collegiate conference is regional. [0] Long flights are expensive and inconvenient. You could maybe justify a national conference for men's basketball, but that would eliminate all the minor sports and also would probably violate Title IX. [0] admittedly, minor confused conferences like Conference USA and Big 12 stretch the definition a little bit, but they're still essentially regional.