If I write one of my usual answers, full of sparkling wit, startling clarity, and profound insights, but in my haste to translate my timeless wisdom to the printed page I somehow manage to misspall soemting, and this misspelling is pointed out by a commenter, I'll edit my answer to incorporate the fix.
If (not that this has ever happened) I make a technical error of some kind in an answer, and a commenter points that out, I'll likewise improve my answer based on their input.
But what's the etiquette if a comment adds good information? In the past I have usually just left those as comments, so as not to be taking credit for someone else's ideas. But today I got to thinking that comments are sometimes cleaned up and deleted, and in general, we're supposed to think of them as ephemeral things without the staying power of real answers.
If someone adds a good piece of information to an answer of mine in a comment, is it good or bad to subsume that comment as part of the answer?