Book signings

I'd like some feedback from other authors regarding how many books they typically sell at a book signing.

I'm not talking what's typical for James Patterson! LOL

For those thousands of us poorly read authors who have done good work but are lost in the sea of new books published each week, what is working for you?

I am seriously pruning down my marketing efforts to those things that I react to personally.

For example, I very seldom go take a look at a title thrown out on Twitter. I still prefer to browse by genre on Amazon or elsewhere, or read book reviews before I buy. I particularly like Amazon's sample feature.

How about you?  If publishing is a vanity thing, then it doesn't matter if you don't ever see a profit, but if like me, you would like it to supplement your income, it makes no sense to just throw money and effort at non-productive advertising.