The comments were interesting, especially this one:
"I do far fewer signings these days, mainly because so many of them ended up with such poor turnout."
and this:
"I think I draw in a decent number of readers online, but "decent" =/= "huge", and it's something that's built up slowly over 5-10 years, at least. The idea that all writers have to be active online for promotional purposes just doesn't seem terribly efficient to me."
Signings don't produce sales and neither does online promotion. So what's left?