> Say buying a $200 desktop with a wireless keyboard and mouse.
Many desktop OSs just don't cater for the TV experience. The UIs are horrid. I tried using a Windows PC with Win 8 on a 32inch TV. I pushed all the accessibility settings to the max, and it still was barely usable. I had to get on my knees in front of it to use it. I tried some of the TV catch up services in the browser, no fun either.