I noticed that you find a lot of weapons of all sorts, but very rarely items like a chain mail or a plate armor. I'm not speaking of anything with a prefix or suffix, like masterwork, grounded, etc. Just a basic, mundane chain mail, chain greaves, etc. part.

Now if you look at CoreArmor, these items are set as common but they don't have a rarity associated, like         <Likelihood>200</Likelihood>...

So what is the default value? I would say it is 1, and that would explain we never get these.

Now, if you look at the wooden club, you'll see that it is labelled as common weapon, but without rarity... And de facto I don't recall ever finding a wooden club either (not that I want!) ... So my theory is that in absence of         <Likelihood>, the value is 1, and so it explains why so many armors are never found.

I routinely find 10 weapons for 1 armor part in all my games...