Interesting thread ... the only way to economically stay is to stay a month, however when traveling this is next to impossible. One year we did buy one of the Camp "Clubs" which had a non-rsvp listing of places to stay Mon-Thurs on a "show up night rate" for one rate .. it did help one year, but we did not sign back up.
Since we travel with a schedule it is just one of those things .. of course we also volunteer 6-7 months a year or more. And have already chosen an RV Park for our "off the road life-style" possibly next year.
Since some have already brought it up ... yes, during the Summer Season we do not Volunteer, but have done our research to stay at an rv park near our daughters while the grand-kiddos are out of school in the Summer - so we can spend time with the families and participate in their get-togethers too. At $450 month divided by 30 = $15 per night full hook-up with cable, pool, rec hall, etc. in Washington State. But we do pay Electric which runs around $30-40 per month. So we are ok.
Just Sharing.