Scarcity is only part of the equation. Once you have a few million in the bank, "scarce" isn't generally meaningful. So why do the millionaires struggle so to become billionaires? Because at that point, money is the way of keeping score and everyone wants the high score, whether it's dollars, "whuffie" or gold-pressed Latium.
Conversely, Communism failed because A) the Party were hypocrites, living the high life while refusing to share with the masses. Regular capitalists, in effect. B) there wasn't any meaningful way to keep score. Medals were meaningless - akin to the "gold star for participating", and money was off the table. To say nothing of the very idea of elevating oneself above the others was counter to the philosophy.
We really do need some way to feel special, however, regardless of how you measure it. Money has been the primary way to do so throughout much of history, but post-scarcity is descending even on the lower classes now. So it may be time to find other metrics.
Incidentally, playing the geek for a moment, we'll have to presume that gold-pressed latium is a substance whose expense to replicate is more than its assumed value or the Ferengi were complete idiots. Then again, being obsessed with acquisitions, maybe they were.
And even geekier consideration: If, in fact gold-pressed latium cannot be economically be synthesized, does that also imply that you'd have to manually ship it instead of using transporter beams? After all, if I was to create a synthesizer, the transporter seems like the logical starting mechanism.