Slim Jim's target consumer niche is the elusive 18- to 29-year-old guy. It's a male rite of passage with teen guys to buy the first stick "you can afford with the change you have in your pocket," Mr. Marple says. (The standard Slim Jim "Giant Stick" retails for around $1.30.) "It's 'I'm becoming a man,' " Mr. Marple says. But then something happens to guys in their 20s, he says. "They seek variety in snacking, and they're moving to chips and Tostitos." —???