I moved this thread to "Exotics" because we try to keep discussions of animals that may be harmed by interest among hobby fishkeepers in this slightly-restricted space.
I should probably give fair warning that this is something of a can of worms: it's not known, but suspected, that there's a risk that these attractive but hard to keep and not terribly personable animals could be overcollected in the wild. Many people are concerned that having expensive tank-bred animals for sale (which would lead collectors to try to undercut the price), or having suppliers believe that they can make $400 per animal and pass that on to the collectors to encourage them, could end up making the situation worse.
Also, to my knowledge, no one (hobby or professional) has raised wunderpus or mimics from eggs in captivity.
I think I'll also move the post in octopus availability to this thread. One reason we move things to exotics is that the exotics forum is not visible to people who aren't registered or logged in, and so isn't indexed on google.
edit: I don't mean for this to have a chilling effect on discussing the idea, I just wanted to move the post and reiterate some of the concerns I've seen. I'm not horribly opposed to breeding exotic cephs to reduce collection pressures, but frankly, I do think it would be preferable to put effort into organizing captive breeding of the species that are known to have large populations and make good pets, like bimacs and briareus, and perhaps bandensis, although it's less clear that we know their status in the wild.
edit2: see this article for further discussion http://www.thecephalopodpage.org/mimic.php