Look at it this way:

For the most part, four things get done on the potty: Women whiz, they crap, men whiz, they crap. 3/4 of those things need the seat down. Ergo, seat down is the majority of what gets done on the potty.

FWIW, my house sees regular visitation by sailors (how about that one... ;-). It has been my observation that the VERY BEST (and one in particular is literally the very best, he designed BOUDICCA's sails) sailors that have crashed at my house put down the seat (and make the bed up too!) So in this discussion does indeed relate to multihull sailing, and a standard worth aspiring to.

BTW,
Pecorak: a lack of manners on your part is absolutely no surprise to me. It is my most sincere wish that I never ever have the mispleasure to meet you.