If it were KU, OSU, or Texas then the attendance is larger and not as many frat boys playing pickup games. However, it's TCU on a very nice weather Saturday and the 2 teams are 8th and 9th in the Big 12. That's not a good combination to get fans to come out.
When I was a student at OU, I had student tickets and went to almost every game. I bet in my fraternity of at least 100 men, only 15 of us went to the basketball games. Everybody went to football games but far fewer attended basketball games and this is back around the final 4 teams. More went to the bigger games or the Saturday night games if no big parties were planned on campus.