FWIW, there are lots of shops that offer free tire rotations (every 10,000KM). I've taken advantage of this service myself. They offer it as a loss leader to get you to do other work or just so you can experience their service/shop in hopes that you come back. So there's little reason not to have your tires rotated, you'll save yourself $$$ on not only the service work, but paying for new rubber well before it's due.
Some shops even offer this service regardless of you having bought the tires there or not.
Some shops even offer this service regardless of you having bought the tires there or not.