Look, I know that the Touhou Project series of moe bullet-hell games is big in the otaku world, but I really didn't know it was that big. It's pretty effin' HUGE.
At least, that's the picture given by the latest amateur work sales features put out by manga/doujin retailer Comic Toranoana. Over 2009, there were more than five times as many Touhou-centric doujin added to the store's selection as the next post popular subject, Hatsune Miku and the Vocaloids. Five times. To put that in specific numbers, five thousand thirty Touhou doujinshi were released, versus a mere seven hundred ninety-six. And that's just from Toranoana. Who knows what the real figures could be once all the retailers and channels are taken into account.
It's it's not all what you think either. Only sixteen percent of the doujinshi released actually depicted the moe maidens of Touhou in various states of carnal bliss. The rest were regular ol' non-ero work. It's no wonder that some of these statistics were picked up from a 2ch thread asserting "Touhou is wasting the limited resources of doujin authors".
Check below for a full list of Toranoana's bestsellers, including percentages of adults-only work versus the totals. Somehow I find funny that nearly all doujinshi pertaining to Dragon Quest were erotic.
[Thanks to Ko and welcome datacomp for the tip!]
Toranoana – Number of doujin titles of major works added from 2009/1 to 2009/12:
From other sites around the web