Big companies often find great ways to aggravate their customers, and cell phone giant Sprint proves the point. John Wall of the Ronin Marketing blog posted a rant about Sprint’s advertising for their Centro Palm smartphone, Screw Your Customers. Wall was understandably miffed when he found out that the $99 advertised price for the phone applied only to new customers, and that as an existing four-phone Sprint customer, he would have to pay $250 for the Centro. Beyond exacting what appears to be a penalty for customer loyalty, Sprint has committed a second sin of the neuromarketing variety. […]