I'm glad you said "a lot of" instead of "all" so-called professional people because then you'd be ignorantly unaware of how many "professionals" make your life easier and safer everyday.
This thread has taken and interesting turn and it reminded me of something somebody once told me - some people are paid for what they do and some people are paid for what they know.
Does society value brain over brawn?
Not particularly. There doesn't always seem rhyme nor reason to what we value in society.