I know you posted this a month ago, but I'll still give you some answers
My brother took the green certificate course, the field crop production one. I wanted to take a course, but the equine technician one came out the year of my graduation and it was too late to start.
My dad was my brother's trainer and my brother could do a lot on his own on, they just reviewed the book together and the hands on stuff every other week or so.
And I'm not surprised that the trainers want to do it. Because of the hands on stuff I'm sure they get the extra help around, and besides, so many people like helping kids achieve something. And as most are farmers themselves it seems, there is probably a tax write off for the time spent doing it
When I was still planning on staying in the agricultural field I had plans on eventually being a trainer for the green certificate program.
I definitely think you should do it. My brother never did go into anything farming related so you could say him taking the program was a waste, but he is still glad he took it.