Mostly because of the seasonality of work. If I own farmland and want to harvest wheat, I need my workforce only in spring and Autumn. But then I need them 25/8

Mostly because of the seasonality of work. If I own farmland and want to harvest wheat, I need my workforce only in spring and Autumn. But then I need them 25/8, if you get what I am saying. Buying this kind of labor on a fair market is definitelyire expensive than just "owning" it.