Why am I being asked to sign a pre-dispute arbitration clause by my financial planner?

I am a NY lawyer and have not seen the document.  However, never sign anything that you don't know the reason you are signing the document or what the document means.  Remeber, the person is your choice, he or she should explain it to you and relate if it is nedeed.  Many times financial planners have the client sign documents simply becuase much is out of their control - like whether the market gores up or down.  However, if it includes things like churning, you may want to reconsider.  My guess is that is pretty standard but ask and do not sign until you understand it and know whether or not it is required.