You'll have a ton of eggs after they're taken from captivity, as their natural diet is extremely diverse and they're producing the eggs off their reserves. The sugar solution is just keeping them on life support—they can't continue to output eggs at such a high rate without protein.
As a nomadic species, a constantly warm habitat temperature and high RH are probably some of the more crucial elements to keeping them in captivity.
They would attack and carry small Drosophila back to the nest, but eventually grew tired of them. Small crickets were hit or miss. They seemed to have little interest in mealworms or waxworms.
I did have constant success when feeding Formula products in early development, but eventually released the colony on account of being inordinately busy.