Imagine trusting your life savings to an investment professional who can't articulate a scientific basis for her recommendations. Are you really supposed to rely on some ill-defined "art" and hope for the best?
Listen, I'm all in favor of limiting your losses when investing -- but the reality is that time is on your side as a younger investor. You need to use this weapon to your advantage while you have it.
I've watched many people get in trouble with upside down car loans, second mortgages or high interest rate financing. Credit keeps many people from living within their means. Then a friend told me he was buying a large house.