In recent years I've written articles on a wide range of subjects, from VLF to optical, for several different radio magazines around the world. Now I don't do it for the money as I have a pension that covers my needs adequately, but I am surprised how poorly radio magazines do pay authors. This may be one reason why they find it hard to find new authors. I won't quote figures here as I don't want to embarrass anyone, but you have to write articles for the pleasure of doing so and not for the financial rewards, especially when tax is deducted.
One of the lowest payers appears to be the ARRL, which I find particularly surprising considering that QST must have one of the largest circulations in the world. Considering how long it takes to put a decent article together with illustrations and schematics (very many hours), the rewards are probably better if one stacked shelves at a local supermarket or worked on the local dustcart. It doesn't exactly encourage budding authors.
Times are hard and revenues in amateur radio magazines from adverts is probably falling, but reading QST, Practical Wireless and RadCom I see pages and pages of adverts that must bring in a decent amount. Maybe they'd get, and keep, more readers if they encouraged people to write interesting articles by paying a little more?