Go for it, Cenbe. That figurine from Haibane you linked to looks well made plus the crouched position reflects her character which makes it extra appealing.
Yep, I collect a lot of stuff, it's just my thing and I'm not ashamed of it

I don't go overboard by collecting superfluous merchandise from every series I've seen, just a selection of anime that caught my imagination.
AKIRA is my biggie and I've got a great deal of merchandise associated with that movie from the various VHS & DVD versions that came out in the UK/Japan/USA, Tshirts & caps, manga, doujinshi, CDs, toys, press releases and even a bookmark... I like to think I have one of the most concice collections of Akira stuff in Europe.
Aside from that I love receiving the fan-made media based on Akira, the cosplay photos, music videos, motorcycle/film/game projects etc because it really perks my interest to witness how it's inspired others.
From other series I have a number of gashapon [miniature egg toys], pencil boards, trading cards, phone cards, posters, artbooks etc. It's all good. Don't shy away from it.