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It can't hurt, but if you're happy the way things are performing now, you could leave it, too. But from my experience -- been trying this tactic for about 3 months now myself, so am fairly new with it, too -- it helps and can give your ad(s) more exposure. For example, I have one product that targets diabetics and seniors, so I can make 2 ad groups, but focus one on the diabetics and one on seniors, using only keywords they might use to search -- hope that made sense. I started with just one general ad for the product for everyone looking for something like it, which gets clicks, yes, but not good ROI, in fact, can get expensive. So it's like segmenting possible click-thru's, targeting them very narrowly so as to increase ROI and decrease useless click thru's, saving you a few $$$.
Did that help? Hope so!!
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