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Odds are you've never heard of Chris Downie, or SparkPeople, the diet site he founded in 2001 after leaving eBay. But buyers seem to be interested. We hear that Downie has a $75 million offer on the table. The site has 2 million unique visitors, according to Alarm:clock, making it the third most popular diet website after WeightWatchers.com and Nutrisystem.com, and is expected to break even this year. Seems like a fat price for such slim profits, but diet advertisements are a lucrative staple of the Web.