Yeah, I can totally see a person on par with a Rogue Trader having the equivalent of a Companion (from Firefly) in their employ. You don't even need to be sleeping with them; just another set of eyes, ears, and a person who is skillful in the parlours of people who throw such parties, and why only have one? You never know what sort of party it'll be, and some of your entourage might need dates, too, the kind of dates whose loyalty is tested, and who fit into these parties. As much of an unfocused Rogue trader's stuff should be schmoosing it up at parties, making friends and contracts, getting to know the big movers and shakers, as traipsing through some dusty tomb, or exchanging volleys with the local light cruisers. This isn't to say every RT can't do without, but sometimes, even with all that money, and all those guns, it's still a question of who do you know, and how much do they like you? Some of the best, rarest things you'll ever get aren't a question of money, but of disposition, and of course reputation.
Kind of wondering if anyone will actually say "no", and what legitimate excuse they might give.