Even if you have a high quality website, having a strategy on how to get more +1 is going to benefit the total count (if that is something desirable and needed is a different topic)
Not necessarily. The time you spend thinking about strategies, or starting threads about them, could have been spent improving the quality of your site. The improved quality could induce more additional button clicks than those artificial strategies would have.
But since I don't have any of these buttons on my sites, I don't have to concern myself with it anyway, and can work on better things.