is 10$ the cost the customer pays, or the cost of the delivery? I highly doubt the little electricity (or maintenance cost over time) is 10$ per delivery. Also

is 10$ the cost the customer pays, or the cost of the delivery? I highly doubt the little electricity (or maintenance cost over time) is 10$ per delivery. Also, as a straight comparison, drones are faster, scale better and are able to work at hours humans wouldn't. So even if it was 5$ vs 10$, some could argue that it's worth it. Obviously not in all situations, but sometimes there's an item you need right now and not tomorrow.