Reno Costco almost sold out barely midway through

Jim Rix's book signing at the Reno Costco is being very successful. With a couple of hours of signing left today and all of tomorrow at the store, its stock of his true crime book, Jingle Jangle: The Perfect Crime Turned Inside Out, is two-thirds gone. Jim (and I) are hoping for Malcolm Gladwell's tipping point¹ to be reached soon....
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1. Tipping points are "the levels at which the momentum for change becomes unstoppable." Gladwell defines a tipping point as a sociological term: "the moment of critical mass, the threshold, the boiling point." The book seeks to explain and describe the "mysterious" sociological changes that mark everyday life. As Gladwell states, "Ideas and products and messages and behaviors spread like viruses do." The examples of such changes in his book include the rise in popularity and sales of Hush Puppies shoes in the mid-1990s and the precipitous drop in the New York City crime rate after 1990. [Wikipedia]