On May 7, 7:06 am, Tina wrote:
You may find a wider potential market writing one for the lay public,
or even the traveling public. You'd need huge penetration of the GA
market to do well with a book aimed at us specifically.

Depends on how you define "doing well". Since I don't work through a
commercial publisher (and therefore keep a very high percentage of the
sale price of my books), a mere 1000 copies per year would make the
effort worthwhile from my point of view. What would that be as a
percentage of the GA market?