How did Chaos Orbs become *the* unit of currency?

Initially, alch orb was designed as the "common" trading currency. It was stated by developers themself.

Later, due to naturally low value of alchs (easy to get, prone to inflate), the ongoing inflation and some other factors, they got replaced by GCPs. Which hold their ground for long, up to the GCP recipe disclosure. After it, GCPs were dead in the water.

Finally and currently, chaos became the universal currency. Mostly because they are somehow rare/harder to get hence "precious".
Rarity and usefulness (it's an actual crafting orb, used on a regular basis) make of them a relatively stable currency. Not so expensive, not so cheap. Not inflating much, because rarity. Allows expensive trades in a single trade tab.
Ideal trading currency (for now).

I remember one thread a long time ago where some dude was asking people to stop charging an alch for everything. He thought it was too expensive haha.

I've lately wondered what type of economy we'd see if gear became account bound after being traded. Currency would be able to be traded without limit.

You'd end up getting the 'real' price of items, because flipping would become non existent for gear.

Ever since that one interview with David Brevik about his thoughts on trading I've been thinking about this.

EASY:

Botters!

Chaos orbs are generated by a simple recipe.
Other currencies require more complex generation like rare drops or harder to obtain recipe.