Heavy Metal, Riftdross, Riftcinder

[Babekeke]

Supply/Demand: Supply drops > demand rises > price rises.

Price rises > People farm them > supply rises.

Supply rises > Demand falls > price drops.

Price drops > people stop farming them > supply drops.

Rinse and repeat.

[Annalise]

Supply/Demand: Supply drops > demand rises > price rises.

Price rises > People farm them > supply rises.

Supply rises > Demand falls > price drops.

Price drops > people stop farming them > supply drops.

Rinse and repeat.

Voidwatch isn't something that someone can just go and solo farm, though.

If people want to specifically make gil from something, they will likely just go to delve which will not only make them more money, but is also more consistent. Random chance of Heavy Metal vs. lots of plasm guaranteed which can be sold. Many people on my server (and others) have made ridiculous gil from Delve. One guy on my server was saying he used his plasm -> gil to purchase all of the currency for Relic bow in less than a week.

So yeah, people know about supply and demand. Pointing out supply and demand really does nothing here. If people want money, they will likely just go to delve instead (as it's a lot better anyways for making money) or do something else that is consistent and better.
If people were to actually get other people who want HMP to do voidwatch with them for farming plates for trials, it's going to take forever to get 1500 x the number of people who want them to get them all.