I think it's worth pointing out a couple of things about ceph biology that seem to have been overlooked in this discussion:
1) female cephs can store sperm for a long time, so often if you get an adult female, she can lay eggs even if you don't "bring in a stud." I'm not sure how many of the tank-raised female octos are separated enough that they can't have been fertilized by the ones they've been raised by, but certainly most wild-caught female cephs seem to be ready to breed.
2) cephs' reproductive strategy is "have a whole lot of babies, and most of them won't survive." Even in the case of cats and dogs, it's hard to find owners to give away a whole litter; if you feel obligated to raise all the octo babies, it's just nuts, and it's unnatural to expect that more than a small number would grow to adulthood, even in the wild. Heck, they eat each other. That's not to say that people shouldn't make some effort to treat the animals with respect, but as much as it's human/mammal/vertebrate nature to treat every baby as an important individual, in most invertebrates, that's anthropomorphizing to a degree that's really unnatural. Cephs, by virtue of having more brains and personality than most inverts (I know various folks would insist than I mention stomatopods and jumping spiders and maybe bees and mantids here) really do have enough individuality that there is a tendency to have the "every baby is a unique, lovable, individual," but the way the animals work in the wild doesn't really work so well with that. (As humans, we're also pretty inconsistent about that, in that we apply it to kittens and puppies, but not so much to veal, bacon, chicken, and turkey.)
I bet if we could have a conversation about this with an octopus, cuttlefish, or squid, it would think us goofy monkeys had some very odd and unrealistic attitudes... I imagine a cuttle or squid saying "well, yeah, joe was a great guy, but there weren't enough fish around, so I ate him (with fava beans and a nice Chianti)"
Anyway, raising cephs seems to have a difficult balance at best, and more likely an impossibile contradiction: either all the babies die, or a whole lot of babies live, and you have to find something humane and reasonable to do with them. Immediately. Before they eat you out of house and home and eat each other. And they have to each go to a new owner that has an octo-proofed tank big enough to hold an adult that has been cycled for 3 months and doesn't have a ceph or any fish in it. And they (by some standards) must also be prepared to care for hundreds or thousands of offspring that their new pet may produce.
There's a little more middle ground with cuttles, but seeing Cuttlegirl's recent experience with Baby A's eggs, she's had to struggle to find homes for the 91 eggs. And if just a quarter of the folks who got some of those eggs have their cuttles reproduce, I think we'll have saturated the Bandensis hobby market, at least insofar as it exists around TONMO.