Yeah, typical KOA bashing post, and then all the other KOA haters pile on.
Not a typical KOA. Per their web site:
The campground has something for everyone, including a swimming pool, fishing pond, petting zoo, mini golf, playtower, arcade, rental bikes, disc golf course, waterspray park, hiking trails, and much more. Our National award winning summer recreation program includes, ice cream socials, and live entertainment featuring hula hoop and limbo contests, and not to mention all of our dances, including, chicken dance, macarena, superman, cha cha slide, electric slide, hokey pokey and so many more. The Willits koa aims to provide a fantastic experience for the whole family and ensuring that the whole family leaves with lasting memories.
No surprise they would charge a fee for ALL visitors. No way they can know whether someone is using the amenities or not. "yeah, we did not pay, but didn't think it would hurt to use them for a few minutes".
And as far as reviews, looking at rvparkreviews.com you will be in the minority when you post your negative review.