Security measures are built-in to homeplug devices - see
http://www.solwise.co.uk/net-powerline.htm
I have one device connected to my router, which means other devices can be set up anywhere there is a power socket - including the garage. You can even connect a network switch to a device, just like in a cabled LAN. I do think this is a much easier way for the average person to set up a home network, compared to wireless.