I was looking at creating a custom item that granted me additional skill points. Looking in the CR example of "Cloak of elvenkind" I can understand how they came to the price. But looking at the "Circlet of Persuasion", I'm at a loss as to how the price was determined. Either it doesn't fall under the effect of skill bonus, or its not just that. Can anyone help me understand whats going on?
it gives a bonus to a bunch of skills (intimidate, diplomacy, ...), not just one skill. It probably also gives a bonus on "opposed charisma checks" like you have to make when binding an outside or forcing a mind-controlled person to do something. Arguably it gives a sorcerer (charisma based caster) some extra benefits in terms of concentration checks, etc.
So, it will be a lot more expensive than e.g. an item that gives +3 on one charisma-based skill, if that's what you're asking. It's a fuzzy/weird item so it gets a fuzzy/weird price that is more like "what the guy felt like it should cost" rather than the output of some specific formula.
that's what I was afraid of. wanted to be able to go to my DM with the reason why the item I created cost what it cost.
thanks