Because if they get lose it will be a problem. He just thinks about the down side of things. I found a site it's $287.90 and you get
A container, vertical living space unit, water bottle/dish, 1 non stick food dish and a non stick veggie dish, 1 each nymph nursery, small tube of petroleum jelly, 1 each bag of topline bedding, sponge for humidity control, 5 replaceable egg flats, 1 pound of roach diet, and 2 dozen hissing cockroaches.
My dad is more worried about the pest problem. I am also going to raise crickets and worms. Which he don't have an issue with but the mention of the roaches he was not happy about.