In the 1980s, the economy in Japan was actually in a boom and people in general paid the highest prices for luxury goods and commodities. The employment rate was very low and it was not too uncommon for people to pay a lot of money for the best cars, clothes, and even signed artworks. Naoko Takeuchi grew up in that era, the 80s, and she mentions brands like Versace and French artists like René Lalique in her “Sailor Moon” manga. I don’t believe she was a “noveau riche” by the time that her manga got published. I believe she came from a privileged family and, to me, it is obvious that she knew about art and the finest things of life before becoming famous.