You can generally turn rotors once ; the machining cost is low ( guessing for today $15 per rotor). I have ground off the outer lip myself but never had warped rotors. So I have never replaced or turned rotors in the 40 years I have had them. I understand "organic" pads do not wear rotors ; That is what is on my Nissan Murano and after 77.000 miles rotors look excellent and pad wear is minor . But I do not do any racing where ceramic pads would be needed. I agree with Mike , those pads are nearly gone.
