Mission rewards are nice, but some rewards are more like punishment to some players.
You already spent hard-earned crowns on this recipe? Too bad! Have another copy.
You use costume armor like the Gunslinger Sash and Magic Cloak lines? Too bad! Have a pile of Crests.
So it would be nice if there was a vendor or alchemy machine that changed these items into something that *could* be of use - a Bound copy of a random, not-Known Recipe, a crown/energy credit towards alchemizing that item, or a different type of (untradeable) Accessory. Or maybe Sparks to trade with Brinks, I dunno.
I throw the question of what results are desirable to the forum, and the question of game balance to the designers.
Buy cheap recipe, transmute for not learned and more expensive recipe.
Repeat with accessories. Acquire shadow wings with heavy dragons.