I would only care if I had an issue with said tire, like it wore out prematurely or had some defect.
If I am replacing tires cause they are getting low on tread or they are old from age, I don't care what they look like on the inside, most if not all tire shops charge a fee to take your old tires.
Once I get my new tires I couldn't care less what they do with the old ones,, heck they can make wind chimes out of them or sell them to the zoo for the gorrila's.
I am not a 7000 mile guy or a 50,000 mile guy,, I am a 2/32 guy,, and maybe a 3/32 steer guy.
If the tires are holding up then only tread depth would be a reason along with age to get rid of 'em.
I know and have read that there are folks on here that put 7000 miles on their tires in one trip!!
But hey,, thats your comfort zone, And I am the guy that would not have a problem buying a 7000 mile used tire at a greatly reduced price!
Same thing goes for allot of other things.
Got a killer deal on a used refrigerator, guy was selling it because it was ten years old,, said he has never had one last longer than that.
A big side by side with ice and water in the door,Mint condition!! $100 (talked him down he wanted $150).
It is still my back up in the garage,, seven years later!!
Remember,, One mans loss is another mans gain!!