There is a great deal of difference in what it is that people serve. There are some people, for example, who live for pleasure. And so they seek it above everything else. They give it the highest priority in their life. Of course, over time their senses become dulled and they end up on a treadmill of seeking out ever more thrilling experiences regardless of how corrupt or perverted those experiences may be.
Some people live for wealth, the accumulation of goods and money.
These people bend every effort into making a dollar. In their blind pursuit of things they are willing to sacrifice health, family, friendship, the church. Many live only for their appetites. They practice conspicuous consumption. They need the latest gadget, the newest toy, and go from fad to fad.