You should be bothered though... Now they'll be expecting free photos from you, as you've already gave free photos to them... If I were you, I'd do something about this... A full page ad, and they did not pay you money? That's pretty wrong...
This is just like the photo contract a lame band is trying to get me to sign to be able to shoot their show. Sign it, and I give away all my rights to the photos I took of them for only photo credit? Um, no thanks!
spose it is good seeing your picture though
EDIT he said it ^