Actually, they do care, and evidently cancellations DO make a statement, because they didn't wait for you not to renew, the people who took action, got results.
"The end result is Mr. Metcalf is no longer with Guns&Ammo In addition The editor who published it, Mr. Jim Bequette is stepping down and his position will be taken over by Eric Poole."
http://d2444os31gbwts.cloudfront.net/wp-content/uploads/2013/11/Screen-Shot-2013-11-06-at-6.07.55-PM.png
Still not going to renew though. Money's better spent elsewhere.