In fact, the athletic department as a whole is so incredibly self-sufficient (donors, endowments, etc) that they pay for all of their expenses in a year, then spend a ridiculous amount on facilities upgrades, cool perks, etc for all the teams, and then still usually have several million dollars left that they donate back to the academic side of the University for them to use to lower expenses/provide scholarships to the general student population.
The Athletic Dept lowers (marginally) the contributions from taxpayers to run UNL.