Steve, I have no idea how anyone makes a living writing about guns at any level, must less the specialty market. I would never dream to try. The shooting world, since the 20th century has been more about amateur tinkerers than about professionals I think.
The few people like you that make a living at it are in a very very special business, and I don't think it is one that is going to expand much either. That is sad, but I don't know what else can realistically happen. Publishing entirely electronically may be some sort of salvation but I don't know that it is the real solution and for sure it is not very satisfying. I, and many others, avoid publishing in electronic-only journals. Either way, it costs me about a grand for a ten-page article. I can't imagine writing a book and having it become nothing but electrons either. But that is the future I suppose.
BTW, whatever happened to Campbell after he left the ASSRA? My wife's dog just ate his book the other day and so I just bought another copy. Maybe that is the answer. More dog-eating books to sell more copies....
Brent