I honestly don't see Cayman as a Pirate Haven or FL Haven, it's location makes it more likely to be overrun by the Corsairs or Coalition/Mollys in an attempt to secure their flanks from the opposite side (remember in the storyline Omega-49 is a hotzone between Corsairs and Coalition/Mollys, both sides are always seeking an advantage). The Corsairs wouldn't care much for laundering Credits as their primary concern is getting RESOURCES to fuel their empire (such as the raw materials present within the system) while the Coalition also is seeking the resources of the system and would hardly care less for 'smashing the bank' there considering.