For anyone that's interested, here is a rather long read that actually spells out the mechanics of the selection process...most are really surprised when they see how it's done, or how much goes into it...
The NCAA’s guide to how the 68 teams are chosen, seeded and bracketed for the Division I men's basketball tournament every season.
www.ncaa.com
It's not just a "hey, lets move those two teams around so they can play each other and get better TV ratings"...the whole thing is very complex (and it takes a LOT of time to actually tweak things and you pull teams out of the bracket and vote again on everything).