Marime - the taboo/corrupted state that the Rom use for things that are unclean - can be undone, depending on the nature of it.
For example, using your hands to wash your lower body makes them temporarily marime, but you can wash (or ritually wash for strict Rom interpretation) them to restore them to wuzho, or purity.
For the Rom, the emergence into the 21st Century (some clans 22nd Century) on Terra forced them to face genetics and the consequences of inbreeding. This forced the kris (high councils) of the more successful clans (the ones, in the end, that survived fairly intact on the path of the wuzho) to adapt to reality. They created rituals for bringing gadje into a transitional state (which could last for years depending on the edicts of the kris) which was "questionable purity," and tons better than marime.
For women, the transitional state was shorter because even Rom women moved into and out of a state of marime during menstruation and childbirth, and so they could be moved out of permanent (non-Rom-bloodline) marime-hood more quickly (typically through the marriage ceremony itself).
For men, who are brought into the clan MUCH more rarely, the transitional state lasts a lot longer, even decades in some cases. (Usually when an elder doesn't like the young man or if he fails to adapt to clan rules.)
The Dark Runners are one of the more adaptable Rom clans, hence their survival and even flourishment in the region Behind the Claw. They also keep good relations with the Darrian Confederation, which IMTU has kept more of its technology, and actively trade with the Mal'G'nar and Comsentient Alliance (non-canon star nations in the Beyond as published by Paranoia Press's "The Beyond"). The Rom trade between the Beyond and the Darrian Confederation has kept the Darrians stronger and the Rom richer and more successful.