So provided the farm makes no investments on equipment or expansion, has a great year to get near maximum possible returns and all of that ends up as payment for labor, there is zero spoilage or waste, and you buy the cheapest possible flour, 10% x 1/5th = 2% is the highest possible amount of money you can expect from your flour purchase to go towards farmer's labor. If we use more realistic averages of farm profits it drops down to 1% or less, and if you include the costs of buying and upgrading farm equipment like any successful farm has had to do to stay alive throughout the last 40 years it drops even lower.
And if you look at the amount of land that a farmer needs to own (or god forbid rent) it looks like an even shittier deal for the farmer. At the US average of 40 bushels of wheat produced per acre planted, with a price of $5.55 per bushel, you get $222 per acre. With 90% of that going towards material input costs (its actually negative return on investment at that price but lets just assume 10% margin for the farmer's sake), that is only $22.2 per acre for the farmer, so in order for a farmer to earn $60,000 per year at that rate, they would need to farm about 2,700 acres of wheat, thats over 4 square miles. If we drop to only 5% margins, which is still better than most farms would ever expect, thats about 9 square miles of wheat they have to work. And you can double that again if you go for the more realistic expected margins of 2-3 percent. So unless you have a full 4 mile x 4 mile block of arable land, plus all the equipment needed to farm it, you couldn't really survive off anything less than a 4 mile sided square of wheat planting.
Of course, there is a strong case to be made that if you can't find enough people to help, you've simply bit off more than you can chew and that it is time to scale back your operation.
Also, whenever headlines say "Farmers [something]," they're not talking about actual farmers. They're talking about farm organizations like Farm Bureau that claim to speak for farmers but really speak for the ag industry.