Yep, the post you responded to is a very simplistic way of thinking. Baylor’s arena seats just over 10k. TBA seats almost 20k. So, Barnes’ raise can be paid for in just maintaining ticket sales along with continued revenue from making the tournament.
Scott Drew is not the coach at UT, so in order for him to be hired, UT would have to offer an incentive (i.e. much more money). Based on history, he probably says no. So, if Barnes leaves, UT most likely finds a midmajor type coach. That coach most likely gets a salary of roughly 2.5, and you gamble a bit at whether the new hire will continue selling out TBA and getting to the tournament.