Take note that the 'Report' option is not a form of communication to the poster. In fact, the poster never sees it. Only mods and admins see it.
The report is used to report a post that is not following the forums rules. When you 'report' a member, that is what you are doing...reporting that the poster did not follow the rules.
Clicking 'report' to say 'thank you' 'you are wonderful' 'i love you' 'tell me how to get a million referrals' will never be seen by the poster. In essence, you are reporting that member to the moderators and the administration for making a post against the rules.
You could be banned from the forum for continuously using the report system when there is no real cause to do so.