Market gardens can earn 50% margins on revenues (or higher) if you minimize labor and specialized equipment costs, and establish direct sales channels. According to the USDA, the median total household income among all farm households in America ($80,600 in 2020) actually exceeds the total household U.S. households ($67,521). Of course, your mileage will vary depending on your efficiency, the type of land you have, the location of your farms, your sales channel, marketing, etc.