Using a single statistic of "average income" is a keyhole look at best. If they had a graph showing income in increments of $10,000 on one axis and the number of fly fishermen in each income level on the other, they would have a very different and more useful picture of the truth. Throw in another graph showing income increments vs. age of angler and the picture would be even clearer. Statistics are only as good as the variables they consider, and it's impossible to include all the variables.
A right emblem it may be, of the uncertain things of this world; that when men have sold them selves for them, they vanish into smoke. ~ William Bradford
I finally realized that Life is a metaphor for Fly Fishing.