I don't think it's bad that some people do - but I don't think they realize exactly how long they'll be left with their names altered while we've all re-aquired our previous names. It always looks a little silly unless they're OBZPCs and thus have 30-day name changes.
Agreed. Unless you're doing it because you came up with a name that you like regardless of the fad and wouldn't mind being stuck with for a few weeks, you're going to end up looking pretty awkward.