It's a utopian paradise on earth in the 24th century, with the acquisition of wealth no longer the driving force in people's lives. That being said, I'm sure that there would be a lot of people who want to contribute towards society since they are really thankful for the great lives that they have.
But I'm sure that there would be some lazy people on earth who would do absolutely nothing and just sit around all day enjoying all of the pleasures 24th century earth would have to offer without giving anything back in return.
Do you think that for those people, while they would be allowed to be lazy, everyone else would look down upon them and shun them?
Kim sure looked down on alternate-Paris playing pool all day. That kind of disapproval could well be what motivates people to take on jobs like being waiters.