Basically it's a magical ability that was given to guilds without magic ability. I don't think anybody would argue that it isn't worth the devs.
But in terms of power to development points, why should WWA be so unbalanced compared to haste or holy fury? It's a bit better than haste, significantly worse than holy fury and much, much more costly than both and can't be used all the time (haste and fury can be used as continuously as desired).
Fighters and tinkers are haste guilds. They're given a haste effect, it's just made non-magical to fit theme. I don't see the rationale for it being so much more costly than other haste effects relative to its power.
