Would I assume this pertains to dry camping off-grid? If that's the case, not everyone has jumped into solar, or has the funds to build out a suitable solar system and batteries to suit their needs. For drivable rigs, I'm pretty sure that's one reason they come equipped with genies.
If it refers to camping at RV parks, anywhere from state parks that may only offer 30A electrical hook-ups to FHU private CGs, I can't understand why someone would be running their genny at all. But, even here, there can be exceptions. Two Summers ago we were camping at a nice but less costly CG in the Poconos in PA, not far from Pocono Raceway. During a hot evening, my electrical management system kept cutting out power due to low voltage. What happened was we were on a hill, and our site was at the bottom. That also put us at the end of the electrical line, 30A only in the whole CG. Not enough power remained by the time it reached our site.
I went to the office and talked to both owners, truly awesome folks who explained the problem and the expense it would cost them to add new 50A power across the CG. They offered, and I accepted, to take $100 off my weekly camping rate, and asked if I would mind if I just used my generator for as long as I needed to stay cool.
