Thanks for all the feedback guys and yes I do think some background info is needed here just to clear things up, probabaly should have given the full story when posting up the image but was on my way out :nono:
OK so the estate agent in question is one i d a fair bit of work for, I shoot their high end propertied for sales brochures and advertising etc. They asked me if I had any local landmark shots that they could use in a small section in the magazine but told me they had no funds to pay. They did say that it would be understood if I didnt want to release any images for free but seeing as im relationship building (trying to get more work from them) I decided to help them out and submit 2 images they could use for free and said I didn't care where they went so long as I got credit for them.
They used the one for the front cover which I was suprised to see. Yes I was very happy to have my photo on the front of a glossy mag that circulates well 250,000 copies but also a little sad I didnt get paid for it. However my working relationship with the EA is very good at the moment and ive seen a 50% rise in work from them over the past 3 months so its kinda worked in a way.
I agree with everything you've said, but sometimes there is a means to an end. I gave this free image to a company I work for to help them out of a tight spot, in return they have given me more work as they like what im producing for them. Gotta grease the wheels every now and then mate