I spend quite a bit of time planning my fantasy campsite, but I don't think the business plan will fund my retirement.
The closest model will be Nethergong Nurseries. Lots of space, but not one big open field - it will have a variety of habitats, pitches shielded by clumps of bushes and mini rough half crescents of hedge (rustic, not privet), some light trees like birches to camp beneath, and some woodland pitches. A pond or small lake.
Good but basic facilities: a wooden shed with showers, (with space and hooks out of reach of the water), family toilet block, toilets, a couple of sinks. A freezer for ice packs, possibly a washing machine, and in my wildest dreams a PAYG dishwasher 
Fires allowed - possibly like the ones on Canadian sites where you get an iron firebox and an attached brick BBQ / grill.
No EHU, no amplified music, no big party groups.
Possibly rental of big items like cookers, coolbox, etc to make it more possible for people to come on the train or bus, but without 'glamping'.