Shortened links are misleading, I might have not clicked your links if you wouldn't be hiding it. (already seen it, hate that specific blog, etc) - this makes your stats wrong cause many people might have clicked the link and closed it right away.
Last time I checked, bit.ly's statistics were counting all kinds of bots and did not allow filtering by useragent - they might have fixed this but in case they didn't then your stats are way wrong.