I fail to see why it's an issue. If you hit 700 and infuse your favorite set that costs you 16 cores for 5 armor pieces and 3 weapons, a full loadout. It costs 17 to masterwork a single weapon. If anything the complaints should be about masterwork costs - not infusion. Unless you are spamming infusion on your favorite armor set every +3 light you get this isnt an issue - and if you are spamming you need to learn to manage resources