There's no profit versus the time and materials required. Humans have a drastically lower chance of being caught than Pals do, meaning you'll be wasting at least half a dozen spheres on each person. Market value for an NPC is low. You'll get a little more for one with a halfway decent trait, which is rare, but still not enough to justify the time and effort you put in. You'd be better off crafting spheres to sell to merchants. If you're after money, tearing through everything on the island, opening chests as you find them, seems to yield enough gold and valuables. It's also not a bad idea to have a Mau working a ranch.
There's no profit versus the time and materials required. Humans have a drastically lower chance of being caught than Pals do, meaning you'll be wasting at least half a dozen spheres on each person. Market value for an NPC is low. You'll get a little more for one with a halfway decent trait, which is rare, but still not enough to justify the time and effort you put in. You'd be better off crafting spheres to sell to merchants. If you're after money, tearing through everything on the island, opening chests as you find them, seems to yield enough gold and valuables. It's also not a bad idea to have a Mau working a ranch.