It's a chicken / egg thing. Get in early enough (5k-10k) & the tendency to scallop & get noisy doesn't happen. Leave it too long (and 15,000km is excessive IMO) and rotaion will make the noise worse / more apparent.
I wouldn't pay a dealer to do it but I'm happy to do it myself & take the opportunity to wash wheels, high pressure blast the brakes & clean the guard liners, etc.
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