That's kind of what I was trying to say in this thread.
The thing is, most authors won't capture that 81% who purchased based on what they saw at a brick-and-mortar bookstore. Most authors aren't in bookstores. Online avenues are their only means.
I don't think marketing is an objective practice. There's so much intangible going on through interactions online. Find how your audience reacts best and do that.
Hell, no matter how you want to define it, it's a crapshoot. Might as well be proactive about it. Sitting back and just waiting for something to happen isn't my bag of tea.