There probably is a "logical" explanation as to why the new augments only last 6 hours but it evades me. Why not have just set them up similar to WoW? The bonuses they give are miniscule (either +4 to a skill or and additional 1d4 dmg) when compared to the usual level that the item with the slot high enough to take in effect. Just make it so that you get one augment per item that's permanent and then if you want to swap it for a new one it destroys the old. Because as it stands the augments just feel like a waste of money