Matchmaking websites, such as eHarmony and match.com, are merely the latest in an old industry that profits by connecting couples. “We think today is the only time in history that people made a fortune off the single,” said Grass Valley author Chris Enss. “That’s not the case. This has been going on for decades. Where you leak, the world hangs a bucket.” In the Wild West, optimistic men and women pioneers expressed their desire for a spouse in advertisements that ran in popular frontier newspapers and magazines, Enss explains in her most recent book “Object Matrimony: The Risky Business of …