Capped-price servicing extras

Don't you think this fixed-priced servicing is just a big con? In 2013 I bought a new Holden Calais V with fixed-price servicing at $180 a service. The 1500km service no problem, 15,000km service no major problems. At the 30,000km service they tried to flog me a wheel alignment and an injector service, both declined. At 45,000km service they tried to flog me an injector service and new wiper blades. I agreed to the wiper blades, even though I had no problems, but when I was told that they would cost $100, I declined as well.