In PP's case, I think it's something of a "cop out." I think they *could* do lower prices and would be fine with it, but GW kept shoving their own prices up even as they switched to cheaper materials, and without any serious competition for GW and PP, they just started matching GW for pricing. It's one of the things that turns me off from getting into WM/H. Seems to be working for them so far, so, eh, okay, but I'm still not a fan of that pricing.
(See, guys, I can be critical of other companies!)