I've been a member for fifteen years or more, and I find the "gold member' fee of $38 a year worth it. The quizzes are generally well-constructed, informative and a pleasure to play. However, the "editors" are quite nearly useless: there are so many errors, mistakes, misspellings, and incorrect punctuation that it's not difficult to find something in nearly every quiz. I've been chastised (almost to the point of being banned) for submitting correction notice: "You're being too picky," This was in response to pointing out that a question had a terminating period AND a terminating question mark. I pointed out that these questions are for sale (bar quizzes, school functions, parties, etc) and that they shouldn't be written so bad that it looked like a fifth-grade dropout wrote them. Haha, that wasn't appreciated. The editors can't really "edit" - they only tell you what's wrong (IF they can see it), and although the content becomes property of the site after submission, correction notices go to the author of the quiz, although that person could be long dead and gone, so it never gets fixed.
Yeah, it's worth it, but don't count on much professionalism from the "editors".
Oh by the way - I graduated with a minor in English and I used to be a professional proofreader and writer for US Govt aircraft trend analysis reports and military aircraft maintenance manuals; I know how to proof.