I would never try to dissuade anybody from taking a DNA test, if they can afford it. I just can't see any reason for doing it myself at present, which is my answer to the original question.
Were I to take a test and find a distant cousin, unless he had information that I don't have, I would be no further forward. Even if he did, having seen what passes for research in so many other people's trees, I'm not sure I would be any the wiser anyway.
Mike.