dude, people are going to repost your work without your credits - get over it. This is TUMBLR. Land of those lacking original thought. First, the post always shows the source of the work. second, the people who are going to delete your credit links probably don't give a shit about buying prints anyway. You're not missing out on any cash to be made. what you are still getting is exposure and that is important. keeping posting great photos and stop complaining about people reblogging them.