Yeah you really should. Why not add equipment durability as well?
Maybe they lose 1 durability for every time they attack(weapon) and get hit(armor)? And when you get hit you have a certain chance of losing durability on your accessories like rings and other stat boosting items?
No, durability is one stat too many to track, and besides, in my experience in pen & paper roleplaying games, the main reason you lose items is not durability. It's that they get stolen, lost or break in fights.
I'm already half way to implementing item loss. It will come.
Meanwhile, item replacement is a real necessity. And maybe damage should scale higher, with all values doubled, giving more space for a wider variety of weapons and armour.
