Yes, but that's not neccecarily the only reason for its longevity. The 18+ factor helps, among other things. The fast-paced JP schedule, high level of player involvement, and the generally higher level of universal importance all help to make the Sakura a desireable ship to be on...and also a demanding ship. (Just look at that high character/player turnover!)
But a pirate RP would work - it would just need either a lot of planning, or a hell of a 'wingman'. Concerto happens to be my old GM and he can make one hell of a plot if you let him.