No one knows everything about guns, nor hunting. But I look at it this way....I shoot and hunt as a hobby. But when I get up in the morning, I go to work in a field unrelated to that hobby. That limits my time and ability to research and learn about guns and hunting.
So when someone has decided to devote their working life (or at least a significant chunk of it) to gunwriting, or guiding, or competitive shooting, and thus can put their workday hours to researching gun and hunting related topics, they are bound to have a LOT more experience than me. If they're smarter than the average bear, that makes them worth reading so I can benefit from that time and expertise.
Couple that with the fact that when I can't be out shooting, I like to read about guns/hunting, I'll buy those books and magazines.
