I remember Roy Pails doing a talk a couple of years back- he has been breeding different herp for 20-30 years, he spoke of how he'd seen popularity in some animals come & go... then come back again. An example was Colletts, he bred them in the earlier days & everyone wanted the offspring- a few years later & he struggled to give them away, only to see them in more recent times become harder to find & more sought after.
I can see this happening with Carpets in the not too distant future- who's continuing to produce Murray's, Atherton Jungles, Cape Yorks, Bredlis, etc? Shortly it'll be hard to find something without Jag, Hypermelanistic, Het for something or mixed blood in it.
At the end of the day, keepers need to keep what they are intrigued & fascinated with, not whats rare or what costs more. Trust me when you have the animal home in its enclosure, what others think & what it costs won't come into it anymore- it's just your enjoyment of the species your observing & interacting with.
As for breeding whatever that species is, if you have room for the babies & enjoy having them around I say go for it! If your breeding with only money on your mind, I'd reconsider