Commercial RV parks are all about packing in as many RV's in as little space as possible in order to optimize the profit margin, this is not only about land value, but also cost to run electrical / water / sewer to each site, cost to build loop roads, etc. By contrast public campgrounds often try to be park areas first, and RV sites second. This has trade offs both ways with public campgrounds you tend to get more space between sites, though often the sites are water and electric only with no sewer, and group buildings are often limited to being just restrooms, sometimes with shower rooms and possibly laundry rooms, maybe an outdoor pavilion, but not much else, and usually these are rather spartan. By contrast commercial RV parks, particularly the nicer ones often have more on site amenities, like nicer laundry rooms, often a small store with essential items (toilet paper, water hoses, ice cream, etc.), they will often also have swimming pools, nicer shower facilities / laundry rooms, sometimes on site cafes, game rooms, exercise rooms, club house facilities, etc.
p.s. I have never heard neighbors at an RV park having sex, though I have heard hooping and hollaring while they are 10-15 feet away watching sports on their outdoor TV until nearly midnight while I was trying to sleep.