Most of the people that ***** about tire shop policy haven't been near a tire when it pops off a bead or decides to let go.
Beyond that, you're not paying their insurance.
Is the bodywork on your car really nice? That alone should be incentive enough for you not to roll on tires that belong in the 4th grade. Both my Neon and my Dakota have wrinkled fenders thanks to tires letting go. Not worth it.
Would you roll on NOS '70's tires? They're new, right?