(1) Material traders SELL materials for credits. In what world can you only trade to get stuff?
Candy store guy: "So, kid, you want gumballs. Thing is, you gotta trade licorice sticks for 'em, at a 6:1 ratio. I see you don't have any, so you'll have to convert your gumdrops to licorice sticks first at a 32:1 ratio."
Kid: [grabs jar of gumballs and runs]
(2) Increase material amount gained per scoop.
Candy store guy: "Did I mention you can't buy licorice sticks or gumdrops anywhere either. Nope, you're gonna have to go harvest those from the wilds. Good luck finding a licorice coyote or a gumdrop tree. Don't die out there."
Kid: [Realizes Candy Store Guy drops gumballs, reaches for baseball bat.]
Candy store guy: "So, kid, you want gumballs. Thing is, you gotta trade licorice sticks for 'em, at a 6:1 ratio. I see you don't have any, so you'll have to convert your gumdrops to licorice sticks first at a 32:1 ratio."
Kid: [grabs jar of gumballs and runs]
(2) Increase material amount gained per scoop.
Candy store guy: "Did I mention you can't buy licorice sticks or gumdrops anywhere either. Nope, you're gonna have to go harvest those from the wilds. Good luck finding a licorice coyote or a gumdrop tree. Don't die out there."
Kid: [Realizes Candy Store Guy drops gumballs, reaches for baseball bat.]