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I don't think Alexa ranking is very accurate. One of my site does not get much traffic but it is about 100-110k in rank.
It depends on what you would call 'not much traffic' I guess. What sort of traffic do you get for 100k Alexa?
My Alexa rank is getting decrease check it out and give some review http://www.alexa.com/siteinfo/http://risma2006.blogspot.com