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@booster gave the comment a boost of $3.08, or a $1.08 increase from the amount spent.

Well, there you have it, for a better ROI, stick to using @randowhale for now...

But how can you conclude that these results will be consistent over time? For @booster, it all depends on the no. of bids and for @randowhale, I don't have much idea about how do they calculate their weight percentage in a given range. But there would sure be some variation in results. At times one will win and at other times it may loose.