SWAGging with Apple’s typical markup vs manufacturing & R&D costs, I’d guesstimate each Watch costs Apple about $200. Per my async reply in #77, that gives Apple a break-even revenue of $18B in one year flat, probably netting twice that with over-and-above sheer profit included. So we’re looking at something like $32B first-year revenue on a product that couldn’t have cost more than a billion dollars (!) to develop.
Now that’s some serious upside!