as you might have discovered by googling.

But if dclayh had used google instead of asking the question in a comment, you never would have had the opportunity to respond with your point about expected utility.

Asking in a comment could also attract the interest of others who might not have thought to ask that question, and gives others the opportunity to give their own answer or link to a resource they think is particularly good, that they might be able to answer follow up questions about.