More groundless speculation.
Since Quya are hereditary sorcerers, it seems likely to me that Quyan Families would organize around each other. I get a vary mafia-like feeling from this speculation.
As noted in human society, rogue sorcerers are a threat to status-quo. You can't have that accounted for power, running around as an x-factor. In human society, the Schools arose due to the condemnation of sorcery by the Tusk (which seems to throw a wrench into the Siqu founding the Schools or the Schools reflecting the particularities of Patron Siqu?). Chorae became a check and balance against the Schools, lest cities and states become a reflection of High Ainon.
In Nonmen Society, Chorae didn't exist to occupy the same social niche. For a functional society, the same rule of power applies; you can't just have rogue sorcerers doing what they want with society due to their individual power.
Now we don't know how the Nonmen Kings became Kings (and Curethan offered a pretty tight dissociation that either Nin'janjin or Cu'jara Cinmoi wasn't Quya, therefore negating sorcery as a prerequisite for rule). However, I'm going to take a wild guess and say that Su'juroit became the Witch-King strictly due to his sorcerous ability (and/or possible demonic possession by an agency
).
Overall, it seems to make sense to me that Quya being hereditary sorcerers would put 'the family' first as it were, which would make them one pillar of social structure - it certainly seems to make them a greater fulcrum than simply being a 'noble family,' if your whole family is sorcerous.
Food for thought.