So now we've come around to the idea that Chapterhouse "basically won" the lawsuit?
A decision to file an appeal (and Chapterhouse has not yet filed a notice of appeal, mind) involves risk assessment, just like deciding to defend a suit, take settlement positions, file a lawsuit, argue positions, etc. etc. We do not know what Chapterhouse's risk assessment is, so bear that in mind.
Chapterhouse did lose on some issues. Generally, if the risk of losing ground you have already gained is low, and the prospect of succeeding in an appeal is high, the risks might be acceptable compared to the potential rewards. If the prospect of losing ground you have gained is high, and the risk of succeeding an appeal is low, the risks might be unacceptably high compared to the value of what you might gain and the likelihood of achieving it.
That's just basic risk assessment, and you do it every day. I drove my car to work today, which involves risk. The risk of an accident is pretty low, and the risk of significant bodily harm even lower. I have mitigated that risk with auto, health, and life insurance, and I can further minimize the risk by driving responsibly. What I stand to gain is pretty significant, as I otherwise do not have a means of getting to my office. It is really important for me to drive to work, so today I took that risk.
Put yourself in Chapterhouse's shoes. Try a little empathy. I'm not trying to be patronizing, I mean it seriously. Imagine that you agree with Chapterhouse's positions, which understandably might be hard, but you can read the briefs to get an idea about how the defense views the case. Imagine what Chapterhouse's interests might be, both short term and long term. Then think about the potential risks and rewards of an appeal, keeping in mind that Games Workshop may decide to file an appeal even if you do not. Seriously, give it a try.