Yes, they exist for test proposes but you can use them as custom spwan.
There are two sorts of NPC that sales items for kinah, that usualy nobody use on on a live server, except as I alreday said, as custom spawn.
From line: 81 to 358, they are custom NPCs, that sale a lot of items, all for kinah, that usualy you must buy for AP or you need to grind. (collecting,crafting, skill book, stigmas, recipes..., even manstones.
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All you need are the NPC_IDs from the xml file, you can spawn them where you want.
Just for stigmas you need the npcs from the line: 227 to 287