I know many people are happy to share their photos on the internet just as I am. Its nice to get oooh's and ahhh's and sometimes the constructive criticism but its not nice to learn one of your images was stolen and used without your consent, or at least its not something I enjoy. I have met people though that could care less if someone were to steal their images without any credit in return but I think that a majority of people who spend lots of time and money on their creative hobbies like to be compensated or at least credited for their efforts if someone were to use their work.