Well when they don't eat there's a reason. You are talking about a animal that spends 90% of it's life in termite mounds. Living in the tunnels that the termites have made for venting the mound. They are quite happy in very confined spaces
And just to touch on the cheaply housed have you priced a rack system a cheap rack is $600-$1200 nothing cheap about a rack. Tho they save space when compared to glass tanks