I emphasize seems here because once you start looking at your actual mana curves, you come to find that you actually end up with a variety of different casting costs in the yard in the mid-to-late game
Many commenters echoed that sentiment, expressing their frustration with @dannyflippingdealss complaints
Even if you arent building around dinosaurs specifically, there are plenty of cheap creatures with high powers, like Atarka Efreet, which become harder to kill thanks to Zilortha, Strength Incarnate
It is worth the investment
You could see if the card continues to increase in price but, if you have some Mox Opals collecting dust in your binder, you may want to consider selling them while the prices are high.
The lucky player apparently wishes to remain anonymous, and for good reason - the bounty on the card depicting the most famous piece of jewellery from J.R.R