> Perhaps the unusual outcomes are just more memorable, and so seem more frequent?

That's a good point and could very well be true. I just know I've played plenty of games where I was mad that they didn't show the meaning. So let's say its 5% for native speakers, and up to 20% for non-native speakers - that's still a golden opportunity to expand vocabularies. And honestly it can't be a lot of work to add a couple lines of static text. At worst it would be ignored, and at most, help people learn more interesting words.