I don't understand why you have to buy hardware at all. Surely everything Plug does can be done with some software that sits on any of your existing desktop mac

I don't understand why you have to buy hardware at all. Surely everything Plug does can be done with some software that sits on any of your existing desktop machines. Obviously keeping a desktop computer turned on all day just to run your Plug app isn't ideal but it would be good to have an option to buy the software instead of the $150 black box. Many people have an always-on machine sitting at home running as a media server anyway.