I was thinking about this very thing as I was typing my previous post, actually. Is/are holsters "consumable goods"? SHOULD they be? I guess if one has a holster like I've talked about above (kydex outer half affixed to leather) - then perhaps one should consider them to be consumable goods.
I think so. Cowhide holsters will eventually become unusable if they're used long enough, especially when sweat is part of the equation. Horsehide does a little better.
Kydex will develop cracks and fail over time when it flexes. Belt hooks, struts, etc. are more susceptible, which is why few people are using kydex for that purpose and using more rugged polymers (as you mentioned earlier).