As an OU graduate who has been attending OU BB games for 53 years with season tickets for 25+ years I can tell you for certain that OU is not a good basketball school from the fan support perspective. That being said during the Tubbs and Sampson eras I have seen a few great years when attendance was very good and the crowd was intimidating.
What I see impacting attendance today more than anything is poor usage of corporate season tickets and little student involvement. Continued winning and competition for the conference championship will help increase both. However I think the biggest key is a proactive promotion by the university soliciting greater student involvement.
Utilizing promotions directed at the Greek houses and other campus organizations could improve student attendance by several hundred students per game. Lowering the price of student tickets (make them free if necessary) and attract a few more hundred students to LNC. With continued winning in a big way and student promotions OU would easily attract an additional 1,500-2,000 students. Even with that increase student attendance would be less than half of what you see in Lawrence, KS. It is achievable.
Add the student attendance increase and you will get more noise and opponent intimidation which will generate a couple more wins a season. Get the noise factor up and improve the winning and games at LNC would be elevated to "event" status. Once games be come "events" customer and employee demand for the unused corporate season tickets will grow exponentially and most of those 4,000 unused tickets will be used. Lets say 75% of them or 3,000.
OU's average attendance for the last five home games was 7,721 versus 11,938 tickets sold or 4,212 unused tickets. Get 3,000 of those unused tickets used going to an "event" and add 1,500 students to the attendees and suddenly you have an average attendance of 12,221 which would be an official sellout. Factor in an over estimation of my assumptions by 50% which would lower my estimation of increased attendance by 2,250
and average attendance would still be approximately 10,000 with a probable low attendance of 7,500 and a high attendance of 13,000.
Kruger has the winning going in the right direction. Now the university needs to do whatever is necessary to get the students involved to create the game time excitement necessary to attract the 10,000 fans nightly. The ball is in Castiglione and Boren's court.