Like others said, from a pov of global economics and current geopolitics, it might not make sense. But when you factor in sustainability, independence from the system and health, things begin to make more sense. Mono-cultures degrade the soil, up to a point when it'll no longer be able to sprout that culture anymore, so what do these millionaire farmers do? They just log more and more of our forests in order to plant. That's where all this logging in the amazon rainforest comes from.
All of this happens due to the green revolution & mass automation. We have papers plus empirical evidence you can turn any used up soil into good farming soil, if only we mimic the way nature does it, creating micro-climates with different cultures next to each other. One of the good outcomes of this method is that you don't even need chemical pesticides, because policultures are inherently more resistant to plagues. That and with this method, we attempt to use natural predators to cope with them too. It's basically a method of rebuilding forests, which is why it's called an agroforestry system
All of this happens due to the green revolution & mass automation. We have papers plus empirical evidence you can turn any used up soil into good farming soil, if only we mimic the way nature does it, creating micro-climates with different cultures next to each other. One of the good outcomes of this method is that you don't even need chemical pesticides, because policultures are inherently more resistant to plagues. That and with this method, we attempt to use natural predators to cope with them too. It's basically a method of rebuilding forests, which is why it's called an agroforestry system