Once the true value of spice was realized, many interested parties wanted to find a way to have it without relying completely on one little planet. Over the centuries, several attempts have been made to recreate the environment of Arrakis on other worlds.
However, transporting live sandworms offworld has never proved feasible. Most of the beasts died almost immediately. I have read of one notable flight that managed to keep the worm alive for some time, but the creature’s subsequent rampage cost many lives in deep space. Imagine that scene… Not many thoughts occasion me to shiver, so I’ll be sure to hold onto that precious image.
Once again, the universe reasserts the unlikely value of Arrakis. And so one might imagine just how many interested (and vicious) parties might react to anyone with the foolish notion of transforming Dune into a paradise.