These are games that get added with teams from a lot of the smaller lesser known conferences getting a chance to showcase themselves against a team from another conference just as crappy as their own. The idea is that a win against a school in another conference helps impress the NCAA later on when it comes time for deciding which crappy schools are the least crappy and make it into the NCAA tournament. Basically, it gives all the smaller conference schools a lot more exposure this weekend.
From a betting standpoint, I avoid these games. You might as well buy a powerball lottery ticket instead.