Well, some people like a series or a certain object from it that much, that they would want to have it just for the sake of having them. For instance... Pokémon cards. There's no real value to it, and unless you really play the card game (I have never heard of this), they're just collectibles. Yet, they were all the rage and everybody loved them (and honestly, I still have them just because). There doesn't necissarily have to be a reason to it.
Oh, as for the japanese - I often find that some of the lines come over much better in japanese. There's usually a lot more spirit to it. Not to mention that the english lines always sound forced because the english script usually has to adapt to the lip-synch from the japanese version. The japanese practically always record voices first, then animate it.
Brought up a lot of times on this forum, only with Smash... It's easy, the idea of 'fun' is different from everybody else. I'd rather stay inside during the evening practicing my drawing and I don't get why people go out and get themselves drunk. Meanwhile, out there people are wondering why anybody would want to stay in and just... draw.
Well, fangirls can be weird, I'll give you that. I've known a lot of fangirls for several years and I honestly couldn't tell you what goes on in their mind. The only explanation I can give you is that they like bringing something to their part of the community (mostly the part that loves that one pairing), much like how regulars on certain character boards post funny threads.
As for the buying stuff, well, to each their own. A lot of girls in my class spend practically all of their money to booze and clothes. I couldn't imagine that, but then again, they can't imagine why I'd spend my money on video games and manga. Personally, I have a couple of volumes from my favorite series, but I don't have other collectibles.
Also, as for male and female... Females are more open about it. Males tend to hold back a little on it (this is actually quite the universal truth with every subject, at least in my class).
You're not actually making a point, though... You're just saying "I feel like this and that's that", but now it feels useless to me to even reply. You feel like that, okay? Sure? Don't bother us with it and keep it to yourself? Voice an opinion or bust.
EDIT: Oh, as for my fanboyism, I practically only read manga, because anime is often badly animated, filled with useless filler and overall extremely tedious. Manga goes at your own pace, is much more understandable, has the original author's script (unless you're dealing with Viz) and is much better drawn 9/10 times.
Anime I did enjoy were Tengen Toppa Gurren Lagann, Cowboy Bebop and a few others. Both well written in their own way, mostly excellently animated (there were some irks, but only 2-3 in the whole series, rather than a whole bunch every episode), good action and excellent soundtracks. As for Naruto (since it's been brought up), it's just poorly written, mostly ripped off, not very impressive art and the anime is usually horribly animated. The manga is finally picking up the pace a little, but I'm not sure if the author even knows what the hell he's doing.