No one, here or in the article, claimed they were 'poor'. But most are not as wealthy as similarly-qualified peers in industry. That's all. CMU's CS and AI profs are among the best in the world and companies are keen for these skills.

And what about all the researchers who don't become professors at the world's top computer-science department?

http://www.phdcomics.com/comics/archive.php?comicid=1144