The 2 mean the same thing, sometimes they are interchangeable other times they aren't Interchangeable in the following: Let's not disagree for the sake a few dollars. Let's not disagree because of a few dollars. Not so much here though: Let's say, for the sake of argument, that she did leave the house.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.