That was the case particularly when Knight was Coach. There were many Knight-o-philes who were not IU grads or fans of IU in any way outside of Knight and Basketball. They were often called "revesable jacket" fans in that one side was IU basketball/Knight and the other ND/Colts/Bears or other. These folks never stepped foot on campus unless they got a Holiday Tourney ticket for Christmas that may have been played in Indy if not on campus.
I was baffled the first time I actually met one of these folks after graduation, but I realized over time these folks were for real. Michigan FB has "Walmart Wolverines" who are the same ilk as does Ahia FB and KY Basketball.
Once Knight was gone the majority of these fans spread with the wind...a few are still around: Ducati was a non-grad Knight-o-phile and prolific poster on IU sites who became the mayor of GBI
@TwinDegrees2 bittererly trashing IU after spending time on a IU/Mike Davis racist hate site called Hoops Loops or similar. We have one other remaining here that I am aware of.
The vast majority of IU grads like us follow all sports but certainly some focus more on Basketball.
Very few of these reversable jacket critters left thank goodness.