Wow, didn't expect to see this announcement today. I'm definitely sorry to see JManga go, especially since they have been friendly and open to responding to customer feedback (like pushing to make their titles available worldwide), and their partnership with ALC Publishing has given us a number of yuri manga licenses- including a bunch of titles I like.
It does suck to see them go, but they don't deserve our getting angry at them, and they aren't "betraying" us. If a restaurant that serves food you like goes out of business, are you going to walk up to the owner and rant at them for closing down? I hope not, because that would be assholish. Same deal here. I'm not happy about seeing JManga go either, but am not going to act like a baby about it. That rant concluded (btw, feel free to disagree with me, but arguing with me about this won't change my mind, and likely won't change yours if you still feel that way this point), I am, again, sorry to see JManga go. I appreciate how much they promoted their yuri titles and got some good entertainment out of their releases.