DS9 did seem to go in for these sort of "strong arm" agencies the incite fear in the people they serve. The Romulans with the Tal Shiar, the Cardassians with the Obsidian Order, even the Federation with Section 31. The FCA is just the Ferengi equivalent. And given they're always used in a comedic context, just how much sense are they supposed to make. They're douchebags who have Quark by the balls and he fears them just all other Ferengi do. That's all that matters to the story, and makes enough sense.