Would you rather spend a lot of money on one cruise and go first class or spend a little money on a bunch of cruises and scale down?

I can understand if people who have limited vacation time and can only cruise once a year want to go all out for their vacation ... But if you are retired and can cruise frequently, it seems to me there are ways to scale down on cabin choice and cruise more often!  The cabin is the least important part of the cruise to me.....