Yeah but that's also a function of Power attack stupidity. Let's assume it was limited to the BAB of the last iterative attack. So -5. That's 10 points extra damage base, An ubercharger barb build can pull a 3* multiplier on the power attack bonus, and then a 3* on the whole lot on top. So that's about +90 Damage total from Power Attack, compared to the +360 extra you normally see. It's a huge difference in the punch of things like that.