If Woody 66 is on his/her 10th. pair there must be a problem here, i.e. the shoes wear out too soon. This creates a problem for the environment as too many micro pieces of small of plastic material, from the shoes, are prematurely scattered everywhere and the shoes also end up in landfills prematurely. To the member considering buying these shoes please take into consideration the effect shoes have on the environment.
Without knowing how many kilometres he's put on each Pair, let alone the type of terrain that's a bit of a broad generalization.
Not only that, but due to our individual gait etc some people wear out (exactly the same) shoes faster than others.
Realistically most of us probably hope to get between 8 to 1200 kilometers from a pair of trail runners, however some reportedly only managed 400 kilometers. This ties in with what manufacturers state. Hoka for example say "The 'typical' lifespan for a pair of running shoes falls in the 400-800 kilometre range, which in itself is very broad."
Which when you think about it is in keeping with much of the information available on the internet: I just did a quick search and REI have the following to say: "You should generally replace your running shoes every 300-500 miles.That's because it's around this point that the midsole cushioning on most shoes will lose resiliency and stop absorbing shock as well as when newer, which can cause more impact on your muscles and joints".
There are multiple other sites that say much the same.
Personally I'm on my third pair in roughly 18 months. (I've just purchased a fourth but I have yet to use them, other than a few days walking to check for manufacturing defects).
That may seem excessive but I wear the new shoes for caminos and multiple day walking, they then graduate to become my everyday shoes. (Aside from about two months in the middle of winter). One Pair did roughly 700 kilometers, one appx. 1k, my current Pair has roughly 1100 and are still comfortable.
I would however completely agree that we should take environmental aspects into consideration whenever possible.