What is clear Rodger is that on this particular site alone, far and away the majority of caravanners choose to do their caravanning on a seasonal basis. Surely, it's not for me, you, the cc's or anyone else to obstruct them from doing that...
As RodgerL's figures indicate, the average tourer may use sites 9-10 times a year, but expect sites to sit back and hope they might just turn up occasionally to give them a miserly income. Seasonals, on the other hand, pay up front (albeit at a discount), probably use the site far more often, and even pay for nights they're not there!! Pretty welcome customers, I would say...