I am not saying that there is a lessened value in camping and I need to use this calculation to justify our doing it, but it does help in making certain decisions. If anything, keeping track of this cost pushes me to camp more so I have financial incentive to get the nightly cost down. More nights equals lower cost per night.
I do however also like a nice hotel room overlooking a nice beach on a Hawaiian island as the shipping cost to get the camper there is way too high.