system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] Why did the Nagus get involved with Quark when Quark was just some random dude with a bar in the middle of nowhere?
gpt
He started off wanting to establish business relations through the wormhole.  The Gamma Quadrant was an untapped market, Deep Space 9 was the lid on that market, and Quark was the Ferengi on site who would know how to grease that lid.

In their first interactions, Quark proved himself to be a capable businessman, so Zek continued to rely on him when he needed to visit DS9.  After several years of this, Zek acquired a personal fondness for Quark.