Don't think it was quite that simple though. Didn't Thor'idal have higher weapon damage than Golden bow to complensate for Thori'dal not benefiting from ammo dps ? Basically Thori'dals weapon dps (without ammo because it didn't use any) was exactly the same as Golden bow WITH ammo dps.
Then add in the fact that not all attacks were affected by ammo dps (i'm fairly sure this was the case with steady shot). Therefore thori'dal actually hit harder with steady shot than golden bow. Back in BC steady shot was a much higher percentage of your dps than it was in later xpacs and that made Thori'dal marginally more powerful than Golden bow.
I'm going off very old memories and it's not something I can check with any certainty on wowhead since no weapons use ammo anymore and so the weapon dps values of the 2 bows as shown today probably aren't the same as they were back in BC.. I'm fairly sure i'm correct on the the stuff about steady shot and the relative weapon dps values of the 2 weapons though.