AS I stated above
Those that feel teaching others is a hassel and think they need to get paid for their time. Need not to teach.
IFLYJ3, as an example, do not need to teach. Want to make money? Open a hobby shop. Just my 2 cents.
Life is cheap, everything seems to come with a price tag, But would you charge your children to learn those life lessons that you spent so much time and money learning from your past mistakes. I see this hobby as one big family. And we should voluntarily pass "Training" on to others , as you would pass your lifes knowledge on to your children.