Can you please explain why you believe that willpower is better than power up to 9000 or so?

I'll let Kitru do all the hard work for me.

To explain this, Willpower adds to Bonus Damage at a slower rate than Power does. Willpower is only more valuable because it also adds to crit rate (at a substantially diminished rate compared to Crit rating, but also on a completely different DR curve that is *way* more shallow than any other). When WP gets sufficiently high, the diminishing returns on Willpower's crit contribution will reduce the benefit such that the Bonus Damage contributions are the only appreciable addition and, as such, Power becomes more valuable.