###An example### This question was asked earlier today. The accepted answer by the user "mathlove" was posted within minutes of asking.

Now consider this question. The user "mathlove" also has a very similar answer here on an effectively identical question.
While it's totally plausible that the user forgot that they posted this answer earlier on this question (hell, I myself might have a few similar answers like this), but my (cynical) self says that they chose to ignore this on purpose to gain a little extra rep because of how similar the answers look.
###The question### My question is this, should we still post an answer regardless of the fact we already have an answer on a particular question if we know it to be duplicate? I personally feel it's wrong that we get a little extra rep from the same answers. What do you guys suggest?