It works out to $10 per person per night.
Sure, not everyone will be staying all those nights ... but it's cheaper for those that do.
We had to book all the campsites together to guarantee our block of consecutive sites. It wasn't easy finding and booking five adjoining sites for a weekend in the summer splendor of Sequoia.
(btw, this is iSm browbeating you about money from Not Afraid's applaptop.)