Andee meant they can't survive.
Roaches are the best feeder, as a staple, in my opinion. They are less laborious to maintain than most other feeders, especially silkworms. Silkworms also are fatty, spin silk, which if eaten constantly could pose problems, though I'm not aware of this happening. If you don't want to keep roaches, order small amounts, as you would crickets. I find it pretty ridiculous that people will endure the stench, noise, and escaping of crickets, but turn their nose up at roaches, simply because they associate them with pest species, which they have very little in common with.
Roaches don't smell, are easier to contain (Blaberus genus), are healthier feeders, and can eliminate the need for spending money on additional feeders. Variety is best, but roaches are the only feeder I find practical to culture, in the volume I need, with minimal effort, but maximum results.