The Siren looks even above the Aggressor and Dancer fleet level based on the website.
What is your role in this matter? Are you a booking agent or a guide or what?
I'm an agent. I know some of the Siren guides, though, and I'm able to go along on any trip as a private guide
The value of an agent is that s/he has a whole bunch of options to offer, while the boat operator has only one. The customer pays the same price regardless of which way the booking is accomplished--there is no extra fee for the extra customer care received from an agent.