I don't know about other posters, but the reason I want everything to run through my Linux HTPC is because of the level of integration I can achieve with my custom UI, or with something like XBMC. I don't want to have a semi-reliable system with multiple boxes, IR blasters, etc. when I should be able to integrate everything I want into a single box, with the features, speed, low latency, and UI that I prefer.
Edit: $60, my bad.