I think there are people that are willing to pass on information. The biggest problem is, they don't have enough time, or don't have the skills to teach.
There is also the problem that students often don't have the patience or time to learn.
I have had several people over the years say they want to do what I do, and learn to repair and restore audio amplifiers. They never want to repair televisions, for some reason. I have a spare bench at my shop that is nearly fully equipped that I offer to let them use for free, and have told them that they can use it to do work on things, and I will help them with problems. They have all said they want to take me up on the offer, but nobody has ever worked at that bench but me.
I also think that some people think it is easier than it is, while others think it is harder than it is. In reality, it all depends on the student.