Alice would make a lot because she's billing as a consultant that evaluates needs and produces a working, scalable, "runs itself" solution. She's not being paid for making WP sites, but for identifying that your complex needs can be satisfied thereby.
It's like the old joke, "I'm not billing you $500 for tightening a screw; I'm billing you $500 for the expertise needed to recognize that that was your problem."
(In my work, there have been times when I spent a week working on a problem and ended up with pull request changing only five lines, but it took a lot of research to find out exactly how to change those five lines.)
That's not quite true. He mentioned Alice has better shit to do. She realizes that there is other more important work to do and building a CMS is not the thing to spend time and budget on.
Clyde likely has fewer but very good job prospects, but better job stability and higher pay.
Alice probably learns little day-to-day if she makes a living setting up Wordpress, and likely has lower job satisfaction than, say, Bob.
I'd rather be Clyde, but then I like spending my time coding, thinking and analysing, and tend to be fairly unproductive.