We may have disagreements regarding AI, but you are a man after my own heart.
My only question was going to be regarding the arrangement of the gadgets cost order, but after thinking about it (and reading the two examples) it makes much more sense. I assume acquiring a rare gadget (I.e. a wand) is already costly/difficult enough, and that it does not actually factor into the trait itself (expelliarmus is a spell, the wand while necessary, is not part of said spell) ?