Karl Rudnick, a retired 69-year-old mathematician who lives in Solana Beach, Calif., recently bought a second home outside Minneapolis to be close to family members. He did not have to draw on his knowledge of advanced calculus to reject the idea of paying for two cable TV subscriptions.

“I talked to the cable companies and asked if there was a way to have one account,” Rudnick said. “There wasn’t, and all of a sudden I was looking at spending $300 a month just to have internet and TV.”