Butlers-in-training flock here to learn the tricks of the trade from 70-year-old Rick Fink, who has served British royalty and aristocracy for more than half a century. Fink, whose stately bearing and traditional dress recall an era filled with balls and hunting parties, is devoted to passing on his considerable knowledge to the next generation of butlers. [...] The recent rise of butling schools -- Fink has several competitors -- illustrates the comeback and the modernization of butling. With the proliferation of millionaires, butlers have become the ultimate household manager. [...] High salaries, the potential for travel, and the challenge...