O.k. Let me try...
There are two ways:
Mr. Shirley-way – as Hish they don't need money, because they have slaves. And slaves-species are producers everything what is needed.
Mr. Perry-and-others-way (more ambitious IMO) – and I'm going to go this way.
If it so – they must have another social groups, like engineers (who make this splendid spaceships, weapons), medical (it's a bit dangerous to be Yautja-hunter), caste religious, artists etc.
They must have some kind of currency exchange. But I don't find any examples in books.
My own, belief is that the honorable Yautja do not make slaves of other species. It just isn't done. Using someone of a lower rank to perform tasks for you, would take away respect from you.
Maybe there are something like the caste system of India. There's probably castes within castes, or in this case, a clan may be apart of a certain caste, and within that clan, there are more castes that divide the clan up even further.
A good example I remember is the second AVP comic book (War). There's a good page in the book where it shows the slums, which Noguchi calls "the pit".
It does not show the lower castes as "slaves" per se, but they probably do most of the dirty work.
To me, the Yautja are not only warriors, but they strike me as very spiritual (native American type really).
But we know only one caste – hunters. Other parts of Yautja society are hidden, on mother-ships or homeword. We can only speculate.
It' of course only my personal ideas. I hope it's usefull and comprehensible.
RPG it's a kind of fan fiction. You must be creative at all.
