A lot of it is riding on exact commission amount.
If someone can come up with that number, that would be great.
From what I've seen, if you devise a plan, print a couple of hundreds/thousands well designed flyers, and spam passengers' doors with them, you could do really really well.
I've seen Future Cruise Sales person on Princess, she would sit down in main atrium, in a high traffic area, and place a sign next to a computer, and that was all ..