A PhD for the private sector is one of the worst life decisions you can make.
Okay I'd say this is going a little too far. It's not going to hurt you, but there are definitely better things you could do with your time if you knew you wanted to go to the private sector.
Well, its setting you back in life and wasting years of your life. I didn't mean it in the sense that getting a PhD is just as bad as developing a meth addiction. That would be a disastrous life decision. But when face with several alternative career paths the PhD path (if you are going to the private sector) is one of the worst ones you could take.