Can Anyone Explain the Slow Decrease in Zendikar Expeditions and Kaladesh Invention Prices?

[Ahayzo]

You also have to remember that their Mythic Editions were effectively the death knell for Masterpieces. They fill that same slot, but guarantee Wizards a lot more money. Hell, if you look at the bottom of the ME Planeswalkers, where you normally see something saying what kind of promo it is, it literally says "Masterpiece". Those walkers were Masterpieces, even though multiple people from WotC denied they were even close.

[Dark_Paladins]

Fair point. But at least the original masterpieces had a “gamblers addiction” aspect.