That's a very interesting fact. So you're says that at least from where you live a good bunch of SS fans are girls the prefer shoujo manga?
The would make a lot of sense since I think most of shoujo manga concentrate on building the relationship of the normal girl with the cool and popular guy or the attractive anti-hero who is a rogue with attitude (I think those two type of guys are the most used). Not to mention that such development is filled with a lot of angst coming from the girl.
This is all obviously my perspective and by no means I claim that I'm completely correct. And those SS fans that let themselves be influenced by the shoujo manga formula could be not that much or maybe they are, I wouldn't know either way.
because I'm female, so let's look at in terms of female fans first. all my friends that fans of naruto, 80% were women. They liked the pairing is usually preceded by their love to Sasuke in season 1--handsome and cool person. shoujo-manga readers on average are women. Thats why, they are easy to like Sasuke. on shoujo manga, its easy to find the girl who loves school prince figure, and well, in the end, almost always a happy ending to the story: Oh! unexpectedly, it turns out the Prince liked the girl! that's why there are many fans of SS.
NH, too. they fell in love with Hinata because Hinata--could be similar to them--an innocent girl who secretly loves the boy.
For boys, to be honest, I did not find a single person boys in SS fandom. Sometimes I find them as NH fans, because--no offense to the boys--Hinata better than Sakura. Come on, look at her breast

She's sexy and Sakura is flat-chested. They are not willing to have Naruto end up with a woman who is always hitting his head and had rejected him all the time. In shoujo-manga, we'll easily find a cool young man with a lovely girl--like SS, and an active man--bright hair--with a quiet woman with long dark hair. Its rather difficult to find two characters that are both screaming at each other so often, arguing something, then fell in love. Hmmm, its very rarely.

but I found a manga that follows NS-formula: Pure Love Kamikaze Captain.
but sometimes, I found a fanboy of Naruto that doesnt care who Naruto ends up with, cause if he followed the manga from the beginning, he know that NS would likely to be happen.
@Codus 
now, who. the. hell. are. you?
I never expected to meet Indonesian people here
you make me horrified when you reply to my post with my language. Initially I thought you were using google translate, but then I realized, you used slang. how do you know I'm Indonesian? seriously, you scared me for a moment. btw, no. I'm not a user kaskus. I'm active in fanfiction, deviantart, twitter fanbase, fb group, and yaaa, honestly I rarely find NH. usually, while talking to NH fanboys about their love the pairing, in the end of arguments, they're never able to give specific answers to: why NH should be happen?
Ps: Codus, gw sebenernya gak pinter2 amat bahasa inggrisan, tapi gw gak tega juga nge-reply post-mu pakek bahasa kita, takutnya member yang lain mangap pas baca, hehehehe. dan, sumpah, kamu ngebikin aku mangap selama setengah jam.