i don't see a problem with giving an image to a struggling publisher for a by-line.
in the great scheme of things it is a positive thing, and positive things usually lead to
more positive things ....

i don't think that a struggling publisher being run by friends who ask friends who are photographers
if they are interested in "being involved" is the reason for "photography's decline" ...
there are many other reasons for that ... like the dumbing down of society, and places like flickr
where adv agencies troll looking for cheap images ... there is a huge difference IMHO between
a multi million dollar business, and a struggling publishing company, run by a handful of friends
that don't even pay themselves...