@BULLSHTR
They do the same for college football, a Top 25. I think it's just an arbitrary number they decided on a long time ago. They had to pick some number to create a system. It helps boost ratings and ticket sales when the hype comes along with having a ranking next to your name. College football doesn't allow 25 teams into their playoff system but they still use it so that's why there's no point in having a Top 68 ranking geared toward the March Madness tournament. There are websites that will "rank" teams based on certain criteria and you can look at every team's "rank". But there are multiple forms of the Top 25 rankings in college sports.
NCAA college basketball rankings, polls from the AP and Coaches
WWW.NCAA.COM
Get NCAA college basketball rankings from the NET Rankings, Associated Press and USA Today Coaches poll.
Use the drop down box on the top left of the page.