I had problems when I tried to breed crickets for some reptiles I had. I was excited when I saw how many pinheads hatched, but as they grew to one week size there was considerably less crickets. I talked with someone who had some success breeding crickets and he suggested that they need fine granual food items so it is easier for them to eat as well as keeping a moist pile of peat moss or similar in one corner which is misted to give them moisture and possibly humidity helped too. Either way, if you are trying to cut down costs of buying crickets to feed to your leopard gecko, I would suggest mealworm breeding instead. But if you wanted masses of pinheads for a baby or smaller lizard, breeding crickets help cut costs in feeding little lizards. I have no clue how these feeder companies breed en masses. Too much heat kills them. Too high humidity kills them. Not enough hiding may cause them to eat each other or just die. Too cold they don't move... You get the idea.