My uncle on my father's side was a garbage man. Some of my dad's family would give him crap about lack of ambition, and "just" being a garbage man. But he would go and do his job in the morning, pick up a six-pack of Budweiser, and spend the rest of the day with a bottle and a smile. And he was a lot happier than people I've known living in McMansions driving Teslas who were doctors or lawyers who fit the perception of "success."You cannot, on God's Green Earth, convince me that The Federation doesn't work with some kind of money. There is no way in hell people are willingly working service jobs like being a watier at Siskos or a suds slinger in Bozeman at the theme park because they think it's fun.
Ya know, unless you were allowed to tell people to go to hell in your shop without consequence.
In a post-scarcity society where people could pursue whatever ends they wanted without having to worry about money, I could imagine there'd be a lot of people content with being garbage men or waiters, while being able to enjoy whatever endeavors they wanted.