At this point, every gadget in my house wants a monthly fee. Spotify, Netflix, Amazon Prime, cloud storage, smart home apps, fitness platforms. Even my coffee beans are on a subscribe-and-save program. None of them is outrageous on its own, but together they add up. Then Audible announced a new $8.99 Standard plan, and suddenly the math on my long-running Premium Plus subscription didn’t look so great anymore. My problem with Audible credits