Nat may be the next Branson but many have tried and failed to make it pay. To add to the above,
GA generally and FTO's especially are a nightmare here for numerous reasons
Larger airports (notice how they're nearly all 'International') are allowed to price in a way which makes GA use prohibitively expensive. Even if you can tolerate that, the building rent, fuel cost etc will screw you again.
Any operator (Commercial or 'Club') faces, also, the problem of obtaining adequate utilisation of aircraft and other overheads. Apart from weather, FTO demand is usually either minimal (e.g.weekdays in Winter) or excessive (e.g. calm and sunny weekend in Summer). All that makes it difficult to provide continuity of employment for engineers, instructors etc. The net result is that the student pays a fortune for what is often an unsatisfactory experience but, even then, the FTO isn't making any money !
The better GA and training environment in the USA is down partly to Government and partly to better business as well as, generally, better weather in Florida, California etc.
Landing charges are not allowed at any airports (most) which have had funding from taxes. Also, many GA businesses sell fuel so are keen to make you want to 'call-in'. FTO's achieve much higher utilisation because of weather and offering course or hour building packages to customers. Also, fuel is much cheaper ( currently about 40p litre) as, I assume, are parts and other aviation supplies. Hence, a much cheaper and better flying experience.
The Florida airport with which I am familar has good runways (but has no scheduled or charter services), tower, modern buildings and 24 hour self-service fuel (see
Ormond Beach Aviation - Home Page - Welcome!).
Ormond Beach is by no means unique and the USA has many similar airports which are streets ahead of the alternatives in the UK.