The trouble is that at any point a friendly family site can be bought out by one of the big chains and everything changes.
If anyone is considering buying a caravan or lodge, please check out HPAG (Holiday Park Action Group) as they are bringing a class action against mis-selling and other sharp practices such as making profits from insisting that owners buy wifi, decking, sheds and other items through the site office at massively inflated prices.
Many people do lose tens of thousands, particularly if they have been told they can live on site - you can't do so legally, whatever they say - and at the first sniff that you might have come to the attention of the council you can be evicted with nowhere to go, as second hand units are worth very little. a new lodge or caravan can easily cost £100k, but as soon as you buy it it is worth £40k and the following year you'd be lucky to get £20k for it, unless you can sell it privately, which many sites make extremely difficult, by offering potential buyers incentives such as 'free rent' if they buy direct from them. The rent is, of course, added to the price.
Also, people on some sites are told that they can rent out their units, but the reality turns out to be very different, as the site takes over lettings, and brings in people with vouchers from newspapers, giving them a week's holiday for £10, from which cleaning and fuel charges are deducted.
Some people do stay lucky, and get a lot of pleasure from their sites, but that could change overnight. My advice to anyone considering it is to hang fire until the class action has happened, and see whether holiday parks become regulated with teeth behind the regulations. As it is, site owners are laws unto themselves, and they know it.