Farming is one of the hardest jobs out there. You need to effectively run your own business on fine margins often relying on government subsidies which can change over time, with a lot of risk due to crop failures/livestock disease (culling can be necessary for chickens due to bird flu etc). It requires hard manual labour running the farm with physical risk to you if you work with livestock. Cows don't care if you get sick, they still need cared for no matter what, there isn't much space for holidays or illness. This isn't to mention the few times of the year the tractors are used as you describe, but most tractors aren't this fancy, and how would you like to spend all day every day for a time working the land with the tractor from sunrise to sunset?