You made few good points.
But...
What I've heard from some friends in France, the fly-ins there
are rather second residences for their owners in their mid-life.
(Not for retired, wine sipping, passive people.)
They fly in there on weekends or summer-winter holidays.
The key is the time you need to get there on the Friday evening,
and back on Sunday.
Trying to drive from London anywhere to the coast villa,
will take you hours of stress and jams.
App. in the same time you are at your house door step on the
Atlantic coast in France. (No need to mention the difference
in the estate prices here and there).
So such fly-in must be in an atractive region, offering you
lots of possible activities. Therefore, what I try to create
(at the moment virtually), is a model of such place.
I personally do no golfing, but am a horse fan, so at my
"dream fly-in" there must be a riding opportunity, and of course
plenty of wild landscape to ride into.
Cycling, canoeing, sailing, and in winter, down-hill and
cross-country skiing, skating, snow scooters...
Also a possibility of interesting sightseeing flying should be there...
See any hope for such idea ?
Ptkay