You know honestly carrying illegal things like drugs is probably the only thing that would cover the cost and hassle of keeping a delivery fleet going. I would like to see how many battery chargers, service guys,drone loaders it would take to deliver in a medium sized market. I just don't see how it can be cost effective for anything , it seems better suited for emergency supply drops.

Having watched a few guys mes with the quad copters, I have to think these things will be constantly dropping out of the sky if they are ever put into heavy use. It makes me wonder how the flying wildlife will adapt to them if they were everywhere? Would birds, and bats just learn to ignore them? Would attacks and bird strikes be common? Heaven knows if you get the animal rights groups on you they are persistent.