Hard question to answer Frank.. they are wear items, and it all depends on how you're driving, are you tracking, are you driving the street like it's a race track..
These aren't something that are going to wear out significantly faster than OE components, but just like gas mileage can decrease when performance items are added (because of a heavy foot), if you're using the brakes, they will wear.
Nice part about the replacement side is you don't have to purchase new hats each time, just the actual rotor and hardware, and pads, with the AP calipers being such a staple in the racing community your pad options are virtually endless, everybody makes something for that shape.
(and if there is interest on a group buy, I'm sure we can accommodate..
)