Hmm... Why should one buy S3 weapons if you can get 2.4 BoJ comparable-to-S3 weapons for less time and money? Karazhan + daily heroic = 50 badges / week. You would need 1100+ arena points and of course personal rating to get S3 weapon with same speed.
Anyhow with wotlk they should remove rated arenas and keep them for TTR only. It caused enough damage as it is.