Shoppers spent $10.4 billion at stores on Friday. While that may seem like a large number in and of itself, it's a rather tepid showing when you compare it to sales generated a year earlier. In 2014, consumers forked over a more impressive $11.6 billion. Moreover, store sales on Thanksgiving this year fell from just over $2 billion to $1.8 billion. So what's to blame for the drops, exactly? As you can probably predict, consumer behaviorists point to online sales, which jumped 14 percent on Black Friday from 2014. All told, consumers who took to the web for their purchases spent $2.72 billion. Not too shabby, right? And we haven't even gotten to Cyber Monday (Nov. 30), which is hands down the busiest e-commerce day of the year. Perhaps this suggests that people are getting tired of braving the crowds (and the elements) to snag a good sale in person. Reports of people camping out in stores and trampling over others to grab everything from TVs to denim jeans has like...