The ironic thing is that when I run the numbers, if I factor in selling my RV, I actually am doing better than staying at hotels/motels, and that factors in the rig, gas for the generator, and other items, like the anode rod for the water heater, and so on.
I know this definitely won't be the case when I move to a motorhome or a truck camper, but it is sort of nice to know.
As for campgrounds, I actually don't know how they make it. $35-$50 is about par for the course in the off season around these parts, and it isn't just the overhead, it is the code compliance, regulations, licensing, security (it costs cash to have someone patrolling the CG to toss out the bad apples), and Wi-Fi.