I'd guess the average revenue per passenger to be on the order of $200 / day so for that 10k passenger ship that's about $700M of revenue per year. If they can

I'd guess the average revenue per passenger to be on the order of $200 / day so for that 10k passenger ship that's about $700M of revenue per year. If they can put $200M of that toward the cost of the ship that'd pay for itself in a decade.