Not releasing is bad enough but what really gets me steamed is DVD-only releases of shows I would actually want AoA (or basically anyone other than Kaze) versions of on BD. From sensible companies like Discotek I can at least accept that DVD-only is a necessity for the time being, but when it's AoA and you know their entire business model is fleecing collectors, offering a weaker product for a premium price really annoys me. At least when they don't release, I can keep hoping (I'm still hoping that Funi are going to release Rainbow on disc any second now, even though it will long have since expired!)
The return of Blue Exorcist may have reminded me I'm annoyed about my expensive DVD copies >_>
Granblue is absolutely insanely popular in Japan but not sure how well it's done in the west. If the adaptation is not a complete flop I can see it being worth their while releasing, at least.
R