For the new year

Why is it that despite all Christ has given us, our houses, cars, friends, comfort, personal luxuries, we still crave more? It is almost like Christianity has become materialistic; people are looking at it like it is a trade - "Okay Jesus, I've been reading my bible for the past month so I expect my boss to give me that raise now" or "I'll feed the homeless, but I expect others to notice me and look up to me because of it." The beauty of following Jesus is that nothing is normal; it is personal. Each person will experience a different level of happiness or even suffering, not depending on how good of a Christian they've been, but depending on what way will bring the most glory to God.