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With exactly this argument - who uses it anyway - we could at present stop discussion on all engines except for one. Besides talking about how to spend clients or own money best on PPWhatever outfits.
That out of the way: yes, it is a good move from AV. And it should be taken into account when optimizing for AV.
It's also not always about hits, especially not for commercial sites.
If one can convert the average visitor to $0.5 turnover with well targeted keywords/phrases, 5-10 visitors a day is $75-$150 a month per position. Losing or winning more then a few of those positions can make quite a difference.
You can have only so many optimally targeted and converting keywords/phrases for a product, so it usually pays to be on top for those keywords at any engine, no matter how much traffic they have.