I think that many professional drivers take advantage of seminars and classes at a truck show.
Rutherford's CCC seems to fill up.
Early in my career I attended a government sponsored 2 day log book course that was aimed towards management.
Scheduling and costs associated with time off probably keep many away.
On line courses are getting more popular, but there has to be a ROI. Whose going to drop a bunch of money to have someone tell them what they already know.
the fly in the ointment right there.....what they THINK they know....is that knowledge currant and factual? or truck stop gossup and or second hand news?.....there is not a more knowledgeable person out there then a driver, on current events, government issues, sports and the price of the buffet at Golden corral...LOL