I guess you could also ask: "Does the pro-tier give one any options/additional functionality that the non-pro/non-donation tier doesn't?"

Obviously, if you have to pay for additional functionality (like settings/themes/updates) then it isn't a simple ask for donation. Though, I'd argue to ignore trivialities such as "thank you"-emails and possibly a small visual-only token on the program that you paid/donated, as those barely count as "functionality".