This looks like my crypto portfolio 
or your Viagra one… 
I have no idea why the Argus value would climb up. I got mine 2, maybe 3 years ago, and haven’t used them since. They’re useful as defense against incoming rockets and mines, but so few people seem to be using rockets/mines, that they’re pretty much a dead weapon, like the Heather. You never see them used in PVE.
i use one myself in raids but its usually only in raids. i see alot of people in pvp using rockets though but only on heli builds. they are useful in certain raids though they arent mandatory, they are mostly there for extra points if you want that.
Some people are using them against Imuji grenades, and I’ve also seen people using them against Nest/Trombone builds.
But mostly I see them on helicopters, which is probably what the price climb is about.
It’s also just supply and demand. Even if demand isn’t increasing, the supply has been decreasing.
I mostly just use mine on my Leviathan, as protection against Acari.
My guess is because the mini-pass is ending people are playing lottery with whatever id the next item used for crafting mini-pass items