The Brown-banded Bamboo (C. punctatum) and the White-spotted Bamboo(C. plagiosum) are with out a doubt the two most common species bred in captivity. That's because they are the two most common species of sharks in home/private aquaria. They are without a doubt the cheapest species - regularly offered for sale for $100 or less. These are also two of the hardiest and easiest to keep species of sharks.
The Coral Catshark (A. mormaratus) is the next most common species.
But the hallmark of a great captivity breeding program is that you are regularly breeding species which aren't very common or well known.
I guess I don't understand what you are saying... is it not a good thing that these two species are regularly available now captive bred? I don't know if there are other species coming from the same place or what but I consider this a win for wild populations.
it is an option though, and until they run out I don't see a need to import more.
My contacts at QM say they have a consistent source producing around 10-20/month
While any captive breeding is a good thing, 10 to 20 per month for a wholesaler translates to maybe 10 to 15 stores in the entire country getting them in any given month...and those will be out of only a handful of their top customers...so very slim availability at the retail end. Small volume shops buying from them might try ordering them, but will likely never receive any...at least not till availability gets up into the hundreds per month. Just the realities of how the supply chain works.