As Jazz is away for a while, I have to say that his prolific quizwriting is just part of him...and you'll notice that each one is different and full of new things...for the mere mortal like you and myself, it's hard to do that many quizzes and still remain innovative, for him, it's falling off a log. He has a real life, job etc and yet he still manages to produce quality material and enjoy things here...what a guy!
What I most admire about Jazz is his modesty and positivity though...he enables many people to create quality work here at QL, including yours truly!
So in answer to your question, creating great numbers of quizzes isn't as hard as creating great numbers and great quality quizzes, that's where Jazz excells.
I also would have troubles producing as many quizzes as though it's not exactly pulling teeth, it just comes and goes...I spend a whole month not creating anything..though I have five on my quiz board right now...and then bingo...I get them online.
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I was born under a wandering star.