I have recently used Konxari cards for spirit communication with some success so I am thinking of trying a Ouija board to see what sort of results I get. I see these things simply as tools to help me develop/validate my clairsentience.
I understand negative energy as just that, a negative vibration that has the potential to become positive if surrounded by enough 'good vibrations' ie. positive thoughts, love etc.. I do not fear it, therefore it does not effect me since fear is a negative thought.
Think of how you feel when you are around a negative person - usually, especially if you are unaware of the strength of their negative feelings, you start to feel negative also - so negative energy attracts or manifests more negative energy therefore creates negative experiences such as fear, depression etc.. and so positive energy attracts positive energy such as love, happiness etc..
Just my thoughts :)

rc