My grandpa probably has a few million dollars in assets, but he saved aggressively his whole life and probably worked 40% more than the average non-farmer over the same time span (longer hours, fewer/shorter vacations, retired in his late 70s, etc).
Yes, farmers have a lot of capital invested in their businesses, but their incomes (i.e., what they take home rather than reinvesting in their businesses) still seem pretty modest.
Compared to my cousins who farm, I’m pretty sure I’m wealthier than they are as a software engineer, certainly with respect to income and perhaps also with respect to total asset value.