First of all: punctuate! Second: that is a cable to hook up video sources to the GG's TV tuner so that said video source can be viewed on the GG's screen. It is not for playing GG games on a TV screen.
Try as I might I cannot think of a worthwhile reason for wanting this, even now with a glut of portable devices which have AV outputs.
Didn't even know it existed. Edit; To echo Ccovell.. raylyd, your posts can be difficult to read sometimes due to lack of punctuation.. Even just some full stops would help somewhat. I do think your contributions and comments add to discussion very well, but I have to reread sometimes to make sure I understand it correctly =)
I don't know if that particular SEGA licensed cable package is worth anything, but you can pick up a generic cable like that for a pittance... http://www.amazon.com/Belkin-Audio-Cable-Splitter-1-Mini/dp/B00004Z5CP
I once thought it sounded like a good idea to try to play F-Zero X (N64) (4 player) on a tiny 4" B&W portable TV... I don't think there was any type of reasoning behind it... just pure stupidity and waste of otherwise perfectly good batteries. (Currently I keep wanting to use the PBP feature on my TV to split-screen Tetris w/2xSGB2s...)
I've got a cable like this from an old portable CD player. I've used it to hook up my Sega Nomad to my Game Gear via the AV input on the TV Tuner. However, as the Nomad is NTSC and my TV Tuner is Pal the picture is black & white and distorted.
LOL yeah, if it would be that easy, why people bothering with making uber difficult and time consuming mods for playing the lil' GG on big TV.