I'm reading this table of magic item gold cost formulae, and I'm having a very difficult time understanding it. How do the listings in the "Special" table interact with the listings in the "Spell Effect" table?
For example, under "Charged (50 charges)" it says "1/2 unlimited use base price", but has no listing for any "unlimited use base price".
Or for example, "Charges per day" works out such that if you have 5 charges per day, the item's cost is unmodified. If I combined "Charges per day" from the special table with "50 charges, spell trigger" from the Spell Effect table, would I get an item that has 50 charges, but recovers five each day at no extra cost? That doesn't seem right.
I get the impression that not all of these effects are meant to interact with one another. Could someone explain which ones are intended to interact with each other?