I'm not sure how photographers are so different from writers but not one writer out of the hundreds who have submitted for their previous publications has been paid, asked for compensation, or complained in any way.
Somehow this doesn't surprise me. When I was editing a little literary magazine, I'd get 20-30 manuscripts a day in my mail box. There was very little money or fame in it for anyone (in fact, it cost me a lot to keep it going, which is why I don't do it any more) but there are a lot of people out there who want to be published, no matter what. I'm quite familiar with the economics and social dynamics of small-press publishing. But I still think that publication just for credit is one step from vanity publishing.