Repetitive work can be a drag and there is a certain amount of that on any farm, however there is a great diversity of jobs to do on some farms and training a paid worker how to do something new several times a day gets as old as volunteering to do the same thing over and over likey gets. Training people takes a lot of time and concentration, something most farmers I know need to spend a lot of on things other than training. A real key element is whether the trainee has the passion and ability to learn the skills to become a farmer and whether the farmer can find the time and has the ability to train someone. Learning what it takes to make a farm work has been a lifetime experience for me,,,and I have more to learn now than when I started learning. I spent all my childhood and teen years "volunteering" under a trainer. I would not change it for the world.
The problem that I have seen with some of the organic farms is that their economic situation is not very profitable so they probably need free labor to survive. That is simply not sustainable in my estimation. There has to be a better way.