If one does not care about baseball, soccer, or women's volleyball, then it is easy to pretend like they don't matter. But the NCAA requires all universities to maintain at least 16 sports, and some people do care about every sport. It is closed-minded to disregard or blow off people who do, since they have just as much right to their preferences as basketball fans do.
But here is the bottom line. Football is the cash cow.
What is happening to our men's basketball program is unfortunate, and it doesn't hold up to standards built by MOST of UK's prior basketball coaches. It doesn't even hold up to the standards Cal established when he got here. If anyone actually believes Mitch Barnhart is satisfied, they aren't paying attention. But there are 33,000,000 reasons why this can't be solved with one simple step. And even though the money may exist, UK has made a decision to keep the powder dry for now. The school would rather spend it on capital improvements. If they are forced to spend money to make Cal go away, they want to pay considerably less than $30 million. They are exercising patience because they have to manage a complicated budget that funds many educational and financial priorities, and they understand how to do the job responsibly. It is anything but "very simple".
Some people understand this. Others (like the OP) don't. If one has never managed a departmental budget, it might seem "very simple" (in the OP's words) to spend a huge amount of someone else's money. The truth is that Mitch Barnhart serves under the direction of the Board of Trustees Committee on Athletics, Chaired by Mr. David Melanson. Without Mr. Melanson signing off, Mitch can't buy a new desk chair. A lot of people here (including the OP) don't believe this because they don't want to. This is a Board of Trustees decision.