For the moment you hoard a bunch of useless junk that does not fulfill a basic need, then you are witholding money that could be given for God's purposes and plans for your own selfish reasons. Comparing the basic needs between a technological flourishing culture versus one that is not flourshing technologically is not a good example to prove the case in hoarding riches. Both cultures are meeting basic needs and they are not hoarding a bunch of junk unless certain individuals in that culture were to start in doing such a thing. For one could be rich even back in Bible times. How was this possible? By hoarding a bunch of things that they really did not need.