That's hardly the only reason.
Ancient Sorcery isn't a toy. Emailing nuclear secrets to everyone on the assumption there'll pinky promise to only do the single task we want of them and that it won't leak or be abused.
Especially since the people involved themselves aren't exactly trustworthy all the time.
They do the big necessary jobs, but they aren't nice people and they aren't perfect.
Edit:
When one of the swords was broken it was turned into a divine lightsaber to keep the game going.
I don't want to blindly leap into what a coin might become.
Sure, although, the sword is on the winning side, that is why it works within the laws of nature, it has sanction to exist, while the coins are prisoners that broke out from cell but still in shackles and are unnatural.
[X] Bid them go
-[X] Activate intimidation excellency for the winter fey flex
-[X] Activate ATB and HC with essence, try to detect nemesis
-[X] Activate TTC and IPM with willpower
-[X] Spend willpower to ensure ritual success.
-[X] [Stunt] Drawing herself up, the glamor seems to sublimate from Molly like ice in a pan.
—[X] Surrounded by Winter's monsters and caught between two of its Queens, something boils out from behind her eyes. Invisible and intangible, but as demanding as the kiss of a branding iron on bare skin for those without the
relevance to warrant acknowledgment.
—[X] Reaching out her hand, Molly grasped an implement from thin air as if it was always there. Unlike like so many others before it, this was no mechanical monstrosity - a special difference shown even by the hells to its purpose.
—-[X] At exactly five and one half feet long, it stood an exactly straight bar of steel. Every angle unnaturally perfect from the flattened cap to exactingly sharpened tip. The first tool, and first division of natural chaos into shaped order
—[X] Held just above the floor as she turned, it seemed to almost drag the shadows inwards without touching them, whispering secrets at her feet as they come.
—[X] With a smooth calm that seemed cling like smoke Molly spoke. " I think it would be preferable to clear the room".