...Nebraska has filled their 90K+ stadium 396 games IN A ROW, plus they're collecting full share of B1G money in a relatively low cost state. Makes sense that they have superior NIL capabilities. You also have a lot of wealthy Berkshire Hathaway people in the area and relatively robust corporate HQs in Omaha (Union Pacific and others).
In short, when you have fewer options to donate to, you can play better with the big boys.