Whats the real advantage of wave rotors? It seems there would be actually less surface area for stopping. If its not much more than looks, I could take my factory rotors and machine the "wave" on them.
The air flow of the wave rotor helps to disipate heat faster aka better. Basically under the same principals of cross drilled rotors.
As far as surface area, there is no real lose of surface area as far as braking area. Take your brake pad and place it over the brake area. You'll see that it will always be touching to of the wave humps regardless where you put it. But somewhere in the middle there will be a air pocket in the dip of the wave. As well as the inner lip in constant contact of the rotor.
Plus they just look cool. Cool not hot, sense they disipate more heat... get it!