Brembo brake pad life

I have a 2007 TL Type S. I don't drive it a lot, so the car only had
17000 miles the last time I took it to my dealer for service a few
months ago.

They told me the front brake pads were worn out! They showed me the pads
which allegedly were from my car, and they had only about 1 mm left
before the wear sensor would contact the rotor.

While I do frequently accelerate hard, I rarely brake hard. I'm very
suspicious that this dealer has scammed me. He charged about $250 just
for the new pads and the entire front brake job was about $450. They
told me this kind of wear is not unusual with the Brembo brake pads.

What kind of brake pad life have other owners seen? Thanks!

John
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