Redhawk has made a post about the reason why they're dropping it.
http://www.redhawkscans.com/showthre...-with-NEEDLESS
According to one of their proofreaders it's a lot of work compared to
other series because of the "immense redraws". That doesn't come
as a surprise, Imai kami does have a habit of using big fat kanji
overlapping artwork and some other things which really suck up a lot
of time if you want to correct that in the scanlation.