"Importance of ＿ to" or "Importance of ＿ for"?
Which is correct: "the importance of money for someone" or "the importance of money to someone"?
I think these two may have slightly different interpretation. The first one is about how one thinks of the importance of money in general (or in some particular context not necessarily related to that someone personally), the second one is about how money is important to someone.
You could use either, but it's more common to use to in that context.