I read the first four novels back to back, but once Goblet of Fire was released, I had forgotten most of the characters and previous sub plots and had alot of trouble getting back into it - the HP groove that is.
I feel anxious that I've fallen behind, not reading the fifth, and now with the sixth novel out. I'm also dissapointed, because I planned to give the whole series another go so I could catch up and seek bliss in Harry Potter's world as I used to, but I was shot down when I came across a few spoilers (for the 6th novel)... on the fucking BBS -- of course!
Even if I discovered the plot twists early, there is still a wholesome novel waiting to be read. I saw Star Wars however many years ago with the knowledge that Darth was Luke's father, yet I still enjoyed the film with that in mind.
Good luck with the crew, TBF. You've got the power to shun out idiocy completey, so I won't even doubt you for a minute. Maybe if I dive back into the books some time I'll join up.