A post-scarcity society may be something in reach in a few generations... but some technological (start with abundant energy - controlled fusion) and social break-throughs (the notion that there may not be enough work available to roughly provide every work-able individual with a meaningful job which may lead to things like a basic income) have to happen first... Also, deliberately creating scarcity on a large scale for personal gain should become a crime. One severely punishable by that... like, on the same level as genocide... And it should include a lengthy trial at a world court.
If all 'common' needs (food, housing, security, connectivity, some entertainment... call it bread-and-games if you like) are provided for, for most people, the need for money will start to fade and so will the notion of it. Money will be something only the very rich care about. Either because they like the pissing contest or they want to execute a 'larger than life' goal.
For the average person, the ability to barter will no longer be 'money', but the skills you can bring a team that wants to create something 'larger than life'. Those teams can be cooperations of average individuals - they don't have to be kick-started by some very rich, but it may help ... initially. Competition between teams will be based on what value they can bring to someone having the skills the team wants. Someone not happy with the 'working conditions' can always take the 'nuclear' option. "I think I go live in a cave for a while - sodd off unless you bring me a better offer". For those teams the 'human capital' they posses will be their most important asset (energy is plentiful, so materials are plenty as well (through recycling or mass-creation) and as such, of low value). Liquidating such teams will not benefit other teams as much unless their goals are very similar. This will bring natural monopolies - but who cares at such a point? Competition will be a lot less...
I think, when you look at Star Trek, there are many things individuals can't 'just' lay their hands on, in it. But most people don't care much. Transporter credits is one explicitly mentioned.
They are all things an individual couldn't be expected to create within their own means, even if they would have worked for it their whole lives - on their own. Everything material an individual needs to survive can be provided for - everything else they have to 'work' for. They band together and build something larger than what one individual can do. That's how they must have been able to do the things they do in the series. Plenty of people working towards, what seem to be, insurmountable goals, focussing on what they can do best because all their material needs, and quite some social needs are utterly satisfactory provided for.
So, if you want to do something really interesting (with your life, in a post-scarcity society, within your lifetime), you take up an education (or educate yourself up to a point to get noticed), then apply for that job that may get you there. Like one involving boarding an interstellar space-ship. If your dream is to 'explore new worlds', you make certain to make yourself useful there. For the crew 'they' pick motivated people (even if the motivation is caused by a lost bar fight and a stern speech). Not the lazy bums that just want to go sight-seeing. Where 'they' are the people that banded together to realize something bigger than life in the first place.
It's all quite logical.