This is pretty similar to Alsius' merchant's stock. And I assume it's the same in Syrtis too. The capital city will hold the stuff up till lvl12, and at the next city you can find some lvl13-20ish stuff again, and then back at the capital city it'll pick up where it left off which is around 20ish upwards and then there's a gap to 40 or so which is filled in other cities/towns.
I guess it's NGD's way of changing the scenery for us.
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