One could add to the list
- illiterate and embarrassed about it
- illiterate and unaware of it
- read pprune/flyer
- don't like customers who ask intelligent questions (= trouble)
The last one is a problem everywhere; one has to be really careful with the way questions are framed...
The basic problem is that most of UK GA is tight as.... and most people want something for nothing. Obviously one cannot make any money from people who want to pay literally nothing, but over the years the whole business has become structured to scrape out some kind of living from the next layer up which is people who are just really tight.
This in turn means that competence and project management tend to be poor.
It's like most builders - they run 5 jobs at the same time, moving workers from a job where the punter is laid back to a job where the punter is screaming at them, leaving machinery or maybe one token worker on the former site to make it look like they are "just about to come back" to it, etc...
And when a punter with £30k to spend and clear knowledge of what he wants turns up, and being a business/professional person himself he rightly expects a decent service, he can't get it - because it doesn't exist.