14 million readers total (number of total Harry Potter books sold divided by 6)
202,823 readers on mugglenet care enough to visit polls (highest number of people voting on polls)
therefore:
1.5 % of the Readership is online
--
63, 840 writers of HP fanfiction on fanfiction.net
206, 000 of HP stories total on fanction.net
Which means a ratio of 3 stories per person (reasonable)
108,050 of HP stories are catagorized "Romance" (52%)
PAIRINGS
9,950 are H/Hr (5% total) (9% Romance)
14,350 are D/H (7% total) (13% Romance)
8300 are H/G (4% total) (8% Romance)
8350 are R/Hr (4% total) (8% Romance)
9850 of these stories are L/J (5%, total) (9% Romance)
4,850 of these are HP/SS (2% total) (4% Romance)
4,675 of these are SS/HG (2% total) (4% Romance)
14,875 are DM/HG (7% total) (14% Romance)
5,525 are RL/SB (3% total) (5% Romance)
200 are RW/HP (too small to count total)(2% Romance)
All of these ships make up about 75% of Romance Ships: yay!
Therefore, Harmonians make up about 5% of fanfiction.net's Harry Potter Stories
To get the number of Harmonians, we divide the number of authors by the average number
of stories per author and get 21, 280 (for every three fics, there is one author)
Then we take five percent of 21, 280 and get 1, 064. There are about 1, 064 writers of H/Hr on fanfiction.net.
Portkey has about 13, 000 members, most of them Harmonians, which makes sense, because not every shipper writes or posts on FF.net.
Even so, using the "mugglenet statistic" they only make up about 6% of the site's visitors.
They only make up about 0.08% of the readership, total.
--
Factual problems with this data and why it's the best that can be done:
1. Mugglenet's creator is known to be R/Hr. This could affect the perecentage of Harmonians visiting, HOWEVER the number of visitors I used was BEFORE the interview that infuriated so many Harmonians.
2. The poll number is only a small number of Mugglnet's readership, HOWEVER those participating in the poll are a more acucurate number of the fandom itself, as they are more "involved." People not involved in the HP fandom are less likely to vote in a poll.
3. Fanfiction.net is not the only fanfic archive, HOWEVER it is the largest one on the net and is ship-neutral. Therefore, the numbers found there reflect the numbers more accurately than looking at archives like Portkey and Checkmated seperately.
4. The number of readers is actually larger than the one I used, because it doesn't take libraries, one book per family ect. This is a minimum amount of readers and only the ones who read in English.
5. I'm a little biased, being a R/Hr shipper myself though I really don't participate in specific R/Hr communites and stuff. I'm more of a MWPP writer or an L/J shippers.
--
Sources:
1.
Wikipedia Article containing book sale statistics2.
Front Page of Portkey's Forums3.
Harry Potter's page at Fanfiction.net4.
Entire Directory of Every Harry Potter FF.net Writer5.
Mugglenet's Past Poll ResultsHope it's of use, somehow. It's the best I could do.