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In several occasions, i've seen senior/legendary members giving the same answer as was given only a couple posts earlyer. I often wondered if these individuals didn't take the time to read all responses before they replied to the thread, untill i noticed they were wearing a sig similar to yours: a cig to promote their own ignore list. So it became obvious: these users just ignored members that were giving fine answers, so they didn't realise the correct answer was already given, and they just "spammed" (for a lack of a better word) the original thread.
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Spam is against the rules, no matter the rank or personal ignore list. Probably best to report these users same as other spammers.