I bred Boer goats in Africa mostly to brows on the Acacia thorn trees as part of my scrub clearance programme.
I had a small herd of Boers and boer cross Saanen when I lived in England, local horse owners used to 'borrow' them to clear the weeds; thistles.nettles,and docks mostly. On my land they cleared willow, elder and wild rose as well as the usual weeds,sales were mainly to ethnic markets and I have never had trouble getting a good price for kids.