Lenny Sands, a soft-spoken man with towering, spiky hair, runs a company that makes the Magic Bullet, which is not just any blender, but a device that promises to change your life in 10 seconds. It chops, blends, dices and purees, making dips, drinks and dinners in a spot that dominates the late-night infomercial world. Sands serves as chairman and chief executive officer of Alchemy Worldwide LLC, a holding company that oversees companies that sell everything from self-help CDs to nutritional supplements. He and his partners Brady Caverly and Jeff Clifford are seasoned infomercial experts. They’ve sold enough bun-rockers, get-fit videos and weight-loss products to build Alchemy into a $200 million annual company, but none sells as well as the Magic Bullet, which brought in $250 million in sales in 17 months.