Not so sure that's correct. Speaking of numbers We do a 14 day cruise with carry on. That's a $320.00 savings from what we used to do. Due to an accident we are raising 2 granddaughters. That's little more difficult as they are entering teen years but they do understand what $640.00 can do when the 4 of us cruise.
I do wear my sport coat when boarding, and the girls have to suffer with shipboard shampoos etc. and we do consider where the laundry room is when selecting a cabin... BUT I love getting home and not having wife staring at 8 suitcases of dirty laundry.