I too tend to keep a notepad in my pc with answers & links for commonly asked questions by other users and so there are many times that I will repeat things I've said in the past if I find that the exact same answer fits the situation. I never just plainly repeat my greetings in the introduction thread though. Of course I sometimes copy paste the usual forum reference links for the rules and help threads etc but I always fully read through the user's intro and make sure to give a personally unique greeting message to each even if it's just mentioning how unique their name or avatar is. Point is I agree that some individuals clearly post just for the sake of gaining a higher number on their post counter rather than actually taking the time to get to know individuals in the community and develop each of their individual post statements. Some of these same users are the ones who open up entirely new threads about topics that have been discussed multiple times and often recently on the same section their posting in. There are even times, as mentioned by CloudFish, that I'll answer someone in the help thread and one of these "Post Scoring" individuals will come and repeat the exact same thing I or someone else already previously said in the same post. It's quite annoying and useless really so I totally understand how you guys feel. At least if a user is going to following under an already answered thread don't repeat the solution that someone else already stated but rather supplement it with a point that will further help the individual ex:
A user asks how to get their character that's stuck out of Fluorite and the next poster answers to use the character reset button. Instead of a hundred other people repeating to use the character reset button maybe take a screenshot of it instead to now back up the previous posts answer with a visual aid.