Easy, because looking at the recipe breakdown is if you were going to make every single thing from scratch, even the other ingredients, like those Premium Iron ores. If you planned to make them all the way from the 240 Iron Ores required to convert to fine ores, then to superiors, and finally that many premiums, then at the end, yes, you would need that many pouches in order to supply the solvent, but depending on what iron at what stage you have, you may need less, or just no solvents at all.
Ruin - Scythe - Vindictus DB
That there is the minimum required, as if you had everything prepped and ready and didn't have to do any micro crafting.
Then again the mats required could be totally wrong in the first place ^^
Then again, right now all we have is Fine Iron Ore.
Fine Iron Ore requires 0 Fine Metal Solvents, and 1 Metal Solvent from an NPC.
Meaning if you start at Fine, you're still going to need 30 Metal Solvents.
Fine = 3 Iron + 1 Metal
Superior = 4 Fine + 1 Fine
Premium = 4 Superior + 2 Finest.
Ruin requires 5 Premium, which means 20 Superior, or 80 Fine.
Aka, Why I spent over 1mil~ buying Acid Pouches and Jelly Tissue over the month.