It is cheaper to book the entire cabin for 1 compared to the higher price each if they pair you. Point of reference If they paired me cost was $6565 plus tax, if I booked the cabin paying double rate it was $5400. I questioned this and the guy laughs and says yes it's cheaper not to have us pair you.
So I booked it in hopes I can find someone to share. 30 day cruise Black Sea, Holy Lands, Ms Prisendam, Sept 17 your half would be just under $3000 including taxes.