What if you need a small crew for your 4 man ship? What if you calculated that you need just one more gunner for a little raid? Would you, for a price, hire a few hands(NPCs) to do the dirty work? Think off all the uses they could present!
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That's a great idea i would do it, but would they follow you like a pet when not in the ship and where do they go if you get another person to temporarily fill that spot.