This. I have so much trouble using them as currency. I'm going to have to unassociate them with crates in my mind. Refined metal doesn't even feel like a crafting ingredient anymore.
I was tempted back then but I got over it. I can keep a bunch of keys and not open them. I just tell myself "Only 1% chance! Don't do it Power!" and I would go to a crate website, open 2 or 3 and see what I would've gotten.