Here's why:

This affix adds numerous bonus Gold chests throughout the dungeon.
These chests often contain tens of thousands of Diablo 4 Items Gold, scaling with your World Tier and dungeon difficulty.
When combined with Gold Find boosts, these runs can net you hundreds of thousands per dungeon.

Gold Find Affix - A Perfect Synergy

Another affix worth targeting is Gold Find, which passively increases the amount of Gold dropped in the dungeon by 30%. If you find a Sigil with both Gold Find and Horadric Gold Reserve, you're looking at S-Tier efficiency for Gold farming.

Escalating Nightmare System = More Runs, More Gold

With the Escalating Nightmare system in Season 9, you can chain Nightmare Dungeons back-to-back without returning to town. This not only improves farming speed but also helps you maintain momentum and stack loot faster, making it perfect for efficient Gold acquisition.

How to Set Up the Best Gold Farming Route

Step 1: Target Nightmare Sigils

Look for Nightmare Sigils that contain one or both of the following:

Horadric Gold Reserve
Gold Find

You can craft or reroll Sigils at the Occultist to hunt for these affixes.

Step 2: Optimize Your Build for Clear Speed

Gold farming is all about speed, not difficulty. Run Nightmare Dungeons at a level you can clear rapidly, preferably within Diablo IV Items for sale 4-6 minutes. Prioritize:

High movement speed
AoE damage
Resource sustain
Survivability

The faster you clear, the more Gold you'll earn per hour.