Didn't realize that Swamp. Why are DI teams so reluctant to play DII teams now? I believe it used to happen more than it does now.
It still does happen.
In 2016, 54 D1 schools played 121 games against lower division schools, going a combined 103-18 in those games.
Many of the D1's that play lower division schools seem to be driven by geography and a lack of nearby D1 opponents for midweek games.
Most of the action is among schools with lower RPI's.
Only 2 teams in the top 50 RPI played lower division opponents, and they both had geographic reasons for doing so.
3 teams with RPI's between 51-100, 16 teams with RPI's between 101-200, and 23 teams with RPIs between 201-300 played lower division teams.
This distribution makes sense because lower-tier D1 teams can find reasonably competitive games against lower division teams and because lower-tier D1 schools are in one-bid conferences where they don't care about missing opportunities to bolster their RPI's because their one and only way to get to a regional is to win their conference tournament.
The teams that played the most games against lower division teams tended to be the under-funded programs at HBCU's.
So I guess the answer is that when D1 coaches build their schedules, they schedule lower division schools when it makes sense for their particular circumstances.