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Ducats have always had a high exchange rate due to the effort required to get them.
As for outfits, with any gacha the best thing to do is wait a few days. The first day or two, everybody is scrambling to try and get the most money possible from the types who have to have every new/rare outfit first. Thus, people put up outfits for a higher price on the auction house than they would normally sell for. The normal outfits always have a better drop rate if you don't care about the animation, they should drop significantly in a few days. Usually after about a week the gacha outfit has settled into a good market price once the "gottahaveits" have been satisfied.
I had the special authentic water spirit wear drop but I prefer the look of the pants to the tights and I don't really care about the animation. Problem is there's about 6 people in Alexina trying to sell the normal water spirit wear for 25m and nobody's biting. That price will *not* hold.
Or better yet, find monsters with better CP than you. An old favorite is to run Cooking Dungeon. (Whether or not you just shamelessly nuke everything in sight or actually complete the mission is up to you.)