So you want me to pay you to feed your goats?
Uhm, goats are by far the cheapest way to clear out certain kinds of brush and noxious plants. They're also cute and act like dogs. Pesticides are dangerous and still leave a dead plant, machines jam (and lop off fingers,) doing it by hand takes a long time and can risk major rashes from poison ivy or cuts from thorns. Part of my back yard is impenetrable from the kinds of plants goats eat.
Where I live they get used a lot on highway embankments.