I take it you're not an EVE Online player.
(That said, if torpedo spam turns out to be the most effective way to win battles, I fully expect large factions to invest in huge stocks of them.)
I am. You know why they had to nerf Titan doomsdays after they released them, and why they now require escort to not get effortlessly tackled and killed by a guy with a single frigate and enough time on his hands?
They assumed cost would be a sufficient balancing factor to limit their power. Turns out, cost isn't useful for balancing combat mechanics. If something is powerful enough, people will make the effort to get tons of them. They will then use that power to steamroll everyone who didn't and in the process sieze control of more territory and resources that makes affording even more of that thing even easier.
EVE had a similar finding with the balance of their tech 1 ships. Turns out making a ship objectively inferior to another ship that costs more and is harder to make didn't prevent literally the entire galaxy from just throwing away their cheaper T1 ships. They ended up having to rebalance things to T1s are more valuable as multipurpose ships and t2s are more specialized.
Cost is not a meaningful effector on combat balance. If something is overpowered it doesn't matter how much it costs, people will stockpile tons of them, start wars of conquest to afford doing so, or sell everything else they own so they can use them to afford even more of them.
EVE figured that out the hard way.
It isn't that resources, currency, or rarity are meaningless. Its that they're unreliable as ways to balance items or spaceships because your most organized players WILL have tons of them, and build entire economies around obtaining tons of them.