Because every single one of my gorram armor pieces uses them. Every. Single. One. If I could convert all of my 150+ spinmetal into Helium Filaments, even at a 2 to 1 rate, that would be just [i]dandy[/i]. Hell, I'd give my ascended mats for filaments. For the love of the traveller, give us some alternative to farming. It's not fun having to collect 100's of mats at a time to upgrade our junk.