gomezladdams;1575149; said:
because people will pay
You hit the million dollar question.
Although they are no longer exported from Brazil and supposedely they have/are becoming extinct in the wild, there are PLENTY of people that breed and sell them. There are a few listed registered breeders at zebrapleco.com, but I know over 2 times that many breeders just in Illinois and surrounding neighboring states. So rare is not the answer, it's just people want will spend the money for them in hoping to get them to breed and make money.
Unfortunately, they are hard to breed. They reach sexual maturity when they get to be close to 4" or so. Unfortunately, they take over 3-4 years for them to reach that size. Also, a male and female in a tank will not guarantee a spawn. They must be a mated pair. Therefore, it's best to buy a colony of adults/sub-adults and hope that 1 or 2 will pair and spawn.
I have 2 sub-adults and 3 juveniles. I hope that some day I will breed, but I'm just happy to have them. I do plan to buy more. I have plans of breeding them not for a big profit, but to allow others to be able to keep them. Therefore, I hope to sell them at around $50 or so. Once I recover my losses, then I may lower the cost of them to $25.