these stores have reasons for their policies and there is nothing wrong with utilizing them, as long as you are honest.
my father, O’H, bought a craftsman vice from sears roebuck with a lifetime guarantee. 30 years of heavy use later he brought it back because the gripping surfaces were worn out. he told them that was the reason. he didnt make up some other reason. he didnt demand a refund. he simply asked does your return policy include normal wear. they proudly answered yes and gave him a new one, (which sold for about 5 times what the original cost)
ive told this story over many times, as has my brother, better than any advertising they could pay for, and i imagine thats what they had in mind when deciding on such a policy