[fortybillion]

Cost. Ease of use. Remotes. Integration with existing AV equipment.

All available in a PC connected to your TV, but requiring of effort and understanding.

[PostOnce]

Rather, marketing. No-one profits from you plugging your PC into your TV, so no-one is going to spend marketing money to tell you you can do it.

It's not hard. 1] Plug s-video cable into TV. 2] Right-click ATI tray icon / secondary display / enable. Done.

[akeefer]

Don't forget about audio. Even where the appropriate video output is available, many PC's lack any audio output other than a minijack.

[PostOnce]

Plug the audio cable into whatever produces sound and you're fine. TV/receiver/pc speakers/whatever. Works for me.

1/8th inch -> standard RCA cable is pretty common I think. I have like 3.

[stcredzero]

Lots of gadgets throw that thing in for free. Only having 3 is evidence of frugality. There must be 10 of those things around my apartment.

[GloryFish]

You couldn't pay me to run an s-video signal into my TV.

[PostOnce]

I have an SDTV. I assume you could do the same with a DVI cable and an HDTV. Just replace the name of the cable, the steps remain the same.