No-no-no.
Don't give someone rep because they give you rep. If you recieve rep, whether it be good or bad, you should know you deserve it. People should only give you rep if you deserve it in their opinion - no need to say thanks for that. Once you have a high reputation rating here at LO, if may show that you a respected member of the forum, one whom can be trusted, and someone one may come to when seeking help. That, my friend, is a good thing.