Not at all. Sometimes it's necessary, given that a very important post can be knocked off the radar by pure bad luck. It's better than posting the same thing multiple times.
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Fact remains, would you rather that I bump my own post, or post the same thing 15 times? Let's assume that I'm NOT simply going to do the "right" thing and accept that no one wants to read my post and give up, so I think that bumping is the less obnoxious option.
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My point is this: let us assume that you CANNOT convince a person that his posts are unimportant, or that he should just accept the inevitable and allow his posts to vanish into the ether. If he is GOING to back up his stuff no matter what, having him bump his own posts is less obnoxious than the alternative.