Think about what you've spent $10 on in the past month.
Maybe you treated yourself to lunch or saw a new movie out in theaters. What about your subscriptions? Do you have a Netflix account, pay for Spotify, get the newspaper or a magazine? Chances are, you've spent money on one of the above things. Maybe you made the decision with some thought towards your budget, but you decided the purchase was worth it.
We easily spend $10 every month on objects, experiences, conveniences and even other forms of media. Why not pay for public radio?