Diamond sleuth/salesman Bill Nusser proves that nice guys finish first1. What form of advertising has elicited the best response for you?For the past 12 to 13 years, I’ve been part of a panel for an intro to marketing class and upper-level marketing class at University of Iowa’s business school, speaking to nearly 400 students each semester. A lot of them have provided incredible insights and suggestions that I’ve put into action. Not a month goes by that one doesn’t come to the store. These students spend anywhere from $8,000 to $25,000 and have brought in several hundreds of thousand