Yes, I think they're great to diehard fans and average people. I actually prefer to focus on non-diehard fans, because at the end of the day speaking to diehard fans is just preaching to the choir. Getting more people to have that spark of interest is valuable, but just adding more wood to a roaring fire doesn't do much.
We've tried having about 10-15 fan "games" or "quizzes", and always the same one or two people come to answer the question before anyone else even sees it. We can only do so much on our end, really.