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You hit reload and a new set of these longer ads with logos show up, so there are enough of these advertisers to be rotating through an inventory of ads to display.
I've never noticed this before, but maybe I haven't been searching for the one word popular keywords on Yahoo lately.
Their results are starting to look worse than ask.com's in terms of paid vs. relevant results. When they drop google they'll be pretty much useless to the user imho.