A novice might want to learn it to add another tool to their slim toolbox ;). Because Ruby is a high level language, you can (most likely) get more done in less time, with less work and debugging. It can't hurt to try to learn a new language at all! Instead you should ask yourself "Why shouldn't I learn this language?".
I'll spare you an essay on all the features, but I'll try to give you a few convincing reasons at a glance:
1. It's relevant. This is a choice language to get involved in for many personal projects including scripts, bots, servers, clients, web development, and even solid GUI development. 2. It's elegant. You'll find yourself writing solid code with minimal effort in this language. This incidentally makes it easier to learn, and in my experience more fun. 3. It's highly portable, extendable, and powerful. 4. There's plenty of support within the mudding community with tutors/mentors and resources available.
There's quite a few of us willing to offer any help we can to see you become successful.
edit: Oh, and if we're talking about muds in specific–Ruby offers great string handling with native regular expression support.