Trading is not good anymore. You used to be able to trade anything for anything, and I liked that. I also like scrap though. I think that you should sell your scrap for a certain amount of AstroCoins, and you can buy things for AstroCoins. Scrap could be worth 100, compound 25, resin 25, ammonium 50, astronium 300... Basically, you could sell things you can buy for a net loss, but it lets you buy resources without having to find debris or abuse the battery infinite scrap glitch.