Last, but not least, pre-charmed items. For example, there is a point in Vetistis where you get a ring from someone that has been handed down from generation to generation, and yet it has no charms in it. Don't you think there would be at least ONE charm in it?
Let me answer that question with my own theory (there are many sorts of strange habits, and mine is to make up extra stories and explanations on basis of games, books etc.)
First of all Velrat hasn't specified how many generations were the owners of this ring. So let us suppose that the ring had eight owners who guarded it well. The skill of charming is hard to obtain (as the description states) as few blacksmiths know it. It would be a gigantic stroke of luck if any of the former owners knew that skill.
Charms cost a huge (for most inhabitants of Rivelion) amount of money so inserting any charm would be very costly.
Inserting a charm into an item makes only sense if it will be of any use to you - why should a simple folk insert a charm boosting (for instance) poison résistance, if he (or she0 wouldn't have much contact with any dangers requiring that resistance.
And as for the idea of more different charms - the only one that would (at this point and with such statistics) make sense is a direct damage modifier for weapons and an armor rating modifier for armor.