The reason for having a username is to be able to identify the author of a post. That is why change is counterproductive - it would only confuse readers! I can imagine only one reason for abandoning a name, and that is to distance onesself from the contributions that have appeared under it. However, should a member choose to take on a new identity, s/he must realize that other members will no longer know who s/he is, and it will take time to establish a reputation* for worthwhile posts.
*I don't mean rep points, but the positive impression that builds up over time when one's posts have a high standard.
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'Mercy!' cried Gandalf. 'If the giving of information is to be the cure of your inquisitiveness, I shall spend all the rest of my days in answering you. What more do you want to know?' 'The whole history of Middle-earth.. .'
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