fred - intrigued by your comments. QFC is definitely not a lottery, but a brilliant quiz with a lot of effort going into setting it (not that other quiz setters don't put a lot of effort in as well). If, as you say, "people enter for the fun of answering the questions", why then do so many people have to ask for answers? If it's for fun, what's wrong with a blank space if you don't know the answer yourself? After all, the charity gets the money whether you have a full answer sheet or one with gaps.
Oh, and your somewhat childish comment about people not looking if they don't want to see the answer rather misses the point (as I'm sure you are aware). If you've worked hard to find an answer yourself, it is really annoying when someone just posts the question on a Q&A site and waits to be spoon fed the answer. I'm sure they get a lot of satisfaction from "working out" the answers that way!