It's no-one's business how they choose to spend their time! Going back to the plumber analogy; would you demand a plumber knock off a few hours' labour costs because they were giving free plumbing advice on a forum the night before? If people choose to charge less that's fine, I would still defend anyone wanting or needing to charge a professional rate though. At the end of the day it is some people's livelihood, not a public service. If people are put off by high rates then find someone else or suck it up and attend the public classes.