http://forums.worldofwarcraft.com/th...23784749&sid=1

Your previous Guild Master was not penalized for simply "running a lower level character through an instance." The most likely scenario, should a penalty have indeed been incurred, is that he or she was found to be exploiting terrain, modifying mpq files, account sharing, using profane language, botting, or powerleveling—all which can occur within an instance, sure.

There's nothing specifically bad or wrong with rapidly leveling an individual—or being rapidly leveled—through instance kills and quests so long as all other policies are respected. Have at it.
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Syndri
Blizzard Poster

I know that the questions lately have been about RAF but I have noticed that some people are worried about boosting in general even outside the RAF issue.