Why do so few economics departments offer math-oriented economics courses?

The man who started this went to Evergreen, where I don’t know if they even have an Econ dept.
http://www.eoionline.org
And so did Joe Dear, who pulled CalPERS out of the recession, until he died a year ago.
http://www.latimes.com/local/obituaries/la-me-joseph-dear-20140228-story.html
Now, I’m so sad. An interesting & interested man.