It depends on the rarity of the item too. The newest skirt, Quaintrelle's Ruffled Skirt, for example was 9million gil at the cheapest. Is it worth it? Depends on if how much value one puts on the appearance of your character.
For glamour items it tends to be expensive at first. Then as the content gets done more then the price dips down. Then the prices will rise up again once and the content isn't done as much again.
