What villagers buy kelp?

Could you elaborate on the question, "What villagers buy kelp?" I'm curious to understand the context behind this inquiry. Are you asking about the specific reasons villagers purchase kelp? Or perhaps you're interested in knowing the types of villagers who tend to buy kelp and their potential uses for it? Additionally, is there a particular region or culture you're referencing where kelp is a commonly purchased item among villagers? Clarifying these points would help me provide a more accurate and detailed response.