I recently calculated that it costs me about $150 per night as a part time camper. We take one long (2 week) vacation per year plus about 8-10 weekend trips. Spread the cost of the travel trailer, insurance, etc over those nights. Add in the extra fuel costs (18 MPG vs. 10 MPG), campground fees, etc and I came up with roughly $150 per night.
Definitely not cheaper that a hotel, but you usually can't walk out the front door of a hotel and throw a fly line in the river and catch a cutthroat trout.
Every time we use the travel trailer instead of a hotel, it helps drive down the nightly cost of the travel trailer. My wife asked me if I was ever going to let her stay in a hotel again. The answer was probably not.