My personal observation has been that most people who actually get a response are so gullible. They would never believe everything that a stranger off the street tells them, but let it come from an unknown spirit through a Ouija board and they believe everything hook-line-and-sinker.
My own personal experience was when I was about 13 years old (many years ago). Nobody was a bigger skeptic than me. I surprised myself and had to get away from it immediately. I wasn't religious at all at the time, but I just knew that I needed to get away from it and that there was real power there that shouldn't be played around with. It turns out that I was right.
I always tell skeptics that it's real and they shouldn't mess with it, but if they really want to prove it to themselves they can. Just know that you've been warned.