Mystery is an interesting exception. Wandering through bookstores (after writing my first mystery novel), I discovered that mysteries, as a whole, are the shortest books of any genre, except the best-selling authors all write HUGE mystery novels--their the only ones who seem to be able to get away with it. Thus I'm guessing the word count stats for mysteries are overly inflated by those exceptions.
On the other hand, 110,000 words for sci-fi stories seems to be seriously short, as the majority of sci-fi stories nowadays are huge. I guess it defends how they came up with these definitions (i.e. are they based on the actual average word count of books, or what the publishing houses count as what's 'acceptable' for submission?).
unless your name is King, Rowling, Martin (with G.R.R. in front) or Gabaldon (Outlander or the like, your chances of publishing anything over 100K are slim to none, and 80-90K a better range, in any genre.
That augments my point. Traditional publishers stress book length, since it affects their bottom lines, while ebook sales are constrained by such restrictions, and tend to be significantly longer yet still sell for substantially less--thus the entire word-count index is divided by traditional publishers/vs. Indie publishers. The two are worlds apart at this point--and not just in the sci-fi universes!
@Bondi *** Book Pricing Discussion ***
I am almost certainly the wrong person to look at for pricing. (I can't remember what Lulu's bottom price was, somewhere around $4.37 for a 36-page book including front matter.)
Before jumping on the 'give it away for free' bandwagon, you need to consider your books price elasticity (an economics term).
If your readers buy the same amount, regardless of the price, then there's no sense discounting it. However, if you're selling most of your books to complete stranger on Amazon, then they'll likely purchase more if you price it at nothing.
However, I've discovered that when you give books away for free, you're much less likely to sell any subsequent books simply because the people who collect free books won't purchase sequels.
My best returns haven't been my 'free book giveaways', but instead when I discount books by 75%. Those prices attract the serious readers who, if impressed will purchase more. Free book collectors generally won't purchase anything under any circumstances. Chances are, the people you're selling other books to for free would purchase the same books if you charged for all of them.
But the key is how your readers respond to prices.