Hell, TOS episode Trouble with Tribbles, Scotty starts a bar fight.
I believe he started a bar fight with the Klingons. I agree that's not a great thing for him to do, but it hardly disproves what I was saying.
Wow, that article had almost zero content.
First of all, Star Trek did a horrible job of explaining how this society worked, other than Picard's brief explanation in First Contact that people now sought to improve themselves. Not only was it glossed over like this, but there are lots of references to Credits and other forms of money. So trying to figure out how the economy of Star Trek worked is just an exercise in imagination. Admittedly that can be fun, but there's no real canonical answer.
Secondly, the economic system rests upon a much more fundamental difference. Roddenberry believed that in the future, if humanity wanted to go to the stars, they would have to put aside their "petty differences" and work together. Roddenberry worked very hard through all the shows to depict a future in which humans didn't fight with each other, often having arguments with writers like Ronald D. Moore who complained about how hard it was to create drama if people didn't do petty, mean, evil things to each other. Roddenberry insisted. This, by the way, is the main difference between the "new" films and the old ones. In the new Star Trek reboot, young Kirk finds himself in a bar fight a few minutes into the movie. Roddenberry never would have allowed such a depiction of humans behaving like this to each other (Picard, after all, did get mortally injured in a bar fight while he was a cadet, but it was with a Nossican (sp?)).
Roddenberry said that the humans depicted in Star Trek were just fundamentally different than ourselves. They're better than us. Of course a cashless society doesn't make any sense for us as we are right now. However, if you're already willing to imagine a new kind of person that can set aside petty differences and work together, then you've already imagined a person or society that's motivated by self-actualization rather than simple material wants.
On top of that, there are clearly still some limits on resources, energy, raw materials, etc. Nobody's running around in their own Galaxy Class starship. People "steal" shuttlecraft and runabouts... which doesn't make sense if you can have anything you want. It's a lot more likely that everyone has some kind of fixed ration of replicator time/energy, which is way more than enough to support their basic necessities and typical interests, and it's likely that people get together to do grander things, like pooling their resources together to tackle bigger projects, both for interest's sake and because they believe it's the right thing to do. That's probably the best that a post-scarcity society could really achieve, realistically.
"I've seen the forgeries I've sent out." -- John F. Haugh II (jfh@rpp386.Dallas.TX.US), about forging net news articles