As always capped at 12 passengers by SOLAS: the convention classifies every merchant ship with more than 12 passengers as a passenger ship not merely a cargo sh

As always capped at 12 passengers by SOLAS: the convention classifies every merchant ship with more than 12 passengers as a passenger ship not merely a cargo ship; AFAIK the worst (to profitability) effect is that the ship suddenly needs to carry a doctor.