The other thing is most of the well paid folks, especially in the business fields, are endowed professors, so those examples in Wisconsin might be the (e.g.) Charles Koch Professor of Economics, with who knows ($100k?) of that salary paid for out of an endowed fund. Any decent school will have several of those for the most senior faculty in the business departments. It's also common for local businesses to make donations short of endowments to "augment" salaries for the areas they are most interested in, such as economics and accounting. So the money flows through the school, but is earmarked for higher salaries for the express purpose of attracting the big guys to campus - so accounting firms as a group might donate $200k/year to go to salary for senior accounting professors, etc.