Great discussion. Here’s the thing - if a listener has stayed long enough to hear the outro, then that’s a miracle!
Either they love the show or are in the middle of washing dishes and can’t switch off. Let’s assume the first.
So what are we going to do with this opportunity? I like to put in one call to action and maybe something personal to build rapport. The trouble with pre-recorded outro’s is that it’s trivial for listeners to programme their player to skip it.
For the shows I listen to regularly, I’ve programmed my player to skip the intro and outros. But of course, I’d never do that to your shows. 