Sam Cande, group commercial director at Centaur Media, says no secret sales technique can compete with belief in a product. What does it take to be successful in sales these days? It’s been over 15 years since I first entered exhibition sales. It was a small, local wedding exhibition at Alexandra Palace, and we were hit by a huge storm. Trees were in the road, nobody wanted to leave home and the two owners of the event were hiding upstairs in the or...