Despite farming not being their primary job, they still make a few thousand dollars a year from sales, which I believe should classify them as a small scale farm.
Farmers don't make a lot of money at all, and they tend to get screwed a lot, this is why you always hear of the angry hillbillies taking over the city. It's kind of like musicians making a living. (Farmers are more important because they provide food, but that's not the point).
As far as industrial machines taking over the business, this is just the nature of needing a lot of food in the world. The morals of these industrial machines are questionable at times, but in the end we need food and most people aren't willing to vegetarian so I guess we are going to have to suck it up until we have better methods. Small scale farms also fill a niche market with local meat/produce and often end up trading/selling their products to other farms.
Back to the point of the main topic; your father wasn't scammed out of his life because he worked hard on a farm. I'm sure at some point he realized that he could sell the farm, move to the city, get a desk job and work less hours much like many other people did in rural areas.
I don't know your father, but I would go as far to say that he probably made a conscious decision to stay on the farm for probably a multitude of reasons. Maybe he liked the life, maybe he liked rural areas, maybe he felt a kid would be better raised on a farm doing lots of hard work, it could be anything really.
Farm work isn't smart work because it requires lot of hard hours with little benefit. Doesn't mean someone is wrong in choosing to do it because it is not only necessary for society, but some people really do like it.
When I spoke of my grandfather, I'm referring to grass farming. Corn / soy / industrial livestock farming has almost nothing in common with grass farming so let's completely throw them out for the sake of this topic and reword my statement to this; "My grass farming ancestors believed in working hard and passed this belief onto their children. Their work ethic probably had more to do with what was necessary to survive than their religious beliefs (protestant or otherwise)".