I do understand what you're saying. But what I'm trying to say is that until you understand Ruby as a language, you will not truly understand the RGSS API. It's like trying to run before you can even walk. You have to understand the basics before you can understand how to use the RGSS API. And I'm not saying that you can't learn the basics from a book and at the same time look through peoples scripts and try to see what's going on. But I wouldn't let it distract you from the true goal of learning Ruby. Buy a book, learn how to install Ruby, open up irb (if you buy a book you'll know what that is), the terminal, or your favorite text editor, and follow along. I know the examples seem silly at first.
" How the heck is making the screen say "Hello World!" going to help me?" I get it. But inside that silly, simple, seemingly non-useful example lies the basics of Ruby that you need to know before you can dive into the API. You have to learn how Ruby works. You have to understand how modules, classes, methods, variables and all of that relate to eachother. Where can you call upon certain variables? How does inheritance work? I feel trying to learn Ruby from RGSS is just distracting and will ultimately lead to bad results. It will lead you to only see everything how Rpg Maker makes it and not truly understand how Ruby works and what is actually going on.
Anyways, I'm rambling now

But my final thought on this subject stands at what I said before. Buy a book, and just push yourself to not only get through it, but really try hard to grasp what they are saying even if it seems silly and pointless. Again, not trying to be a jerk or discourage you in anyway. I'm only trying to help you towards (what I feel) is the best direction.
Good luck!
edit:
Here are a few links to a few tutorials. Two of them are video tutorials however you do have to pay a subscription fee, but if you learn best visually then it's well worth it!
http://teamtreehouse.com (mostly web development related, but does have a pretty good Ruby section that is quick and doesn't get boring! Only thing is that they are still adding to it)
http://lynda.com (again this is from my web development resources, but if you're willing to spend the money for the subscription the Ruby video tutorials are fantastic!)
http://coding.smashi...ers-guide-ruby/ (yet another web development resource. This is a quick easy read that very lightly discusses the basics of Ruby)
These are all great resources, but I wouldn't rely on just one of them, especially the smashing mag one because it's not near in depth enough!
Good luck!