(edited by LoneWolfie.1852)
We need some better adjustment to loot drop.
I think these things are only worth it if you’re farming the T5 mats, rather than buying them off the auction. Then it changes the whole complexion of the calculations.
If you farm in Orr, you’’ll end up with a reasoanbly good amount of heavy moldy bags with COULD give you T6 mats, but will mostly give you T5 mats, which you could then change into T6 mats with the mystic forge.
I get plenty of heavy moldy bags when I’m running around Orr.
Edit: And you can get crystalline dust from drops in Orr as well and occasionally from heavy moldy bags.