Less than 2 kids per household average...and you just listed a smasher size home with extra helping of everything.
One that is big enough
for three generations under one roof. Mom and dad out back in the first floor section..just like the Walton's TV show. And the hire hands sleep over the woodshed in the back shed chamber. You and the Mrs and all those kids around a 22 foot long Thanksgiving table.
Selling the big Maine home means pointing out how to convert to apartments, a bed and breakfast inn or using a good section for a home business and living combination.

Hi Andrew - There's a cup for every saucer. I'm in a four-bedroom house without enough room - and it's just me. Eight bedrooms sounds sweet! I shut off the "extra" bedrooms in winter - helps keep the heat bill down.
Liz
I hear you. Many times a couple have a larger home after kids leave but it's home, they like the space. I have a 5 bedroom but two of the four kids home from college so the space with all their friends is needed! Not everyone is cut out to live in a shoebox one bedroom ranch no matter how practical. Space is nice.