Had 3 sets of rear pads (organic) and one rear disk in 35,000 miles. Mines an '04 Servo ABS bike. Front pads are about 60% worn but still good for another few thousand miles yet.
I believe the linked brakes are a bit heavy handed with the rear circuit thus the wear problem. FWIW I try to ride as smoothly as possible and adapt my style to avoid using the brakes where possible.
About to fit Sintered HH rear pads to see if they improve pad wear rates.