[Fat Charlie]

Those chains make their money on the upsells. It's not unethical, it's just using advertising well. They know that by the time your car is old enough that pads and rotors all around for $100 is something you're in the market for, they're not going to be able to touch it without half of the underbody disintegrating- your shiny new pads and rotors aren't going anywhere with that brake line pouring fluid on the floor. It's on the lift and you can either pay for the upsell or pay them to put it back together in nearly undriveable condition.

I've seen ads for cheap mufflers with lifetime warrantees. Nothing else is cheap ot warranteed for life, and everything else is going to need replacing with it. It's easy to give away a muffler or pad set at cost if it brings in someone who needs a lot of work done.