In this week's parsha we read about the mitzvah of Bikkurim. The Torah tells us to bring our first fruits of the season to the Beit Hamikdash, and offer it to the Kohanim. We are also told that the people would bring the fruits in baskets. The Sifri explains that there was a practice for the wealthy to bring their fruits in baskets overlaid with gold or silver, while the poor would use woven baskets. This would ostensibly show their love for the mitzvah.
However one could ask a question on this practice: We often find that the Rabbis would regulate standards in regards to mitzvah practices that could differentiate between the poor and wealthy. For example, the Gemara in Moed Katan (27a-b) tells us that the original custom was for the wealthy to bury their dead in fancy and expensive caskets, however this caused the poor to be embarrassed, thus the Chazal enacted that everyone be buried in simple caskets. Seemingly, the minhag for the wealthy to use gold and silver laden baskets would also embarrass the poor. If so, why didn't the Chazal regulate this practice as well?