Clive
You have a point but that is an added cost to them / to you. In a competative market they have to watch their costs.
Its like when you buy a new printer.
These days they are all USB connections, so you need a USB cable. You wont (normally) find one in the box cause it will cost them to add it, but also take extra revenue away from their distributors who will sell a cable for £4 in a bubble pack that costs probably 40p.