When you pick a great angler you have to be careful. Three of the people listed are basically professional anglers and are able to fish waters at times when the average working bloke cannot.
Cyril Inwood, other than selling some of his trout to pay for his day tickets, never made a bean out of angling.
Even **** Walker never made all that much money out of the sport, other than payment for articles and his AT column. He was Technical Director of Lloyds of Letchworth - a lawnmower company from the end of the war until his death. Walker could have made a fortune out of angling, especially with innovations like the Arlesey Bomb and the Heron Bite Alarm. But he chose not to.
I have been at several occasions where Walker has spoken. He never asked a penny for being there, unlike many of the "names" of today.
However I have nothing against professional anglers. Many of them have put house, job and family life on the line to get where they are today.
Good luck to them.