We were all gaming novices at one time. Many of us still are (including, for the most part, me). However, that does not preclude us from asking expert level Q&A.
There are at least two kinds of beginners though:
The Inquisitive Novice. This is the kind of beginner that reads the rule book, plays the game a time or two, or sit and watches a game at his local gaming shop, or on youtube. Then they show up at the stack and start asking questions informed from the experience of game play. These people may ask basic questions, but they are well formed and the idea behind them is to improve the knowledge they have already acquired. This person will likely ask one or two questions initially and wait for answers and try to find the answers on his own to other questions (maybe even here).
The Help Vampire. This is someone who has taken a cursory look at the books, seen things he doesn't understand and maybe does a small amount of research, then fires off 10 basic questions because he doesn't understand any of the rules and hasn't even watched some basic game play to know the basic flow and mechanics of the game. The term vampire is used because they basically just suck out all of the help they can get and leave a dead hulk of a site in their wake. This kind of behavior unchecked will kill a Q&A site (Yahoo Answers?)
Our goal as a stack is to keep the "Inquisitive Novices" they can manage to ask even basic questions that qualify as expert Q&A because they've done enough research to have the vocabulary and some basic knowledge to understand the answer. However, the "Help Vampire" presents a much greater challenge. Either we can attempt to reform these users and turn them into useful citizens. Or we can communicate to these people that RPG.SE is not the right place for them to learn entire games but is a place where they can come to clarify their understanding of the rules once they actually understand game play.
Let me be clear. I do not see the purpose of the Q&A portion of this site as having anything to do with teaching people how to play RPGs. Stack Overflow is not about learning how to program. Super User is not about learning how to use a computer. Seasoned Advice is not about how to learn how to cook. Christianity is not about how to become a Christian. All of these sites are for people who are there already to improve their skills and knowledge about their (profession/hobby/religion/etc). We are here to teach, but most of the time the very beginners are outside of our purview.
Chat (provided a minimal rep is accumulated anywhere on SE) is available and can be a much better means to actually teach people how to play RPGs. Several users on this site have learned 4e through Brian's weekly chat games where they can play with other experienced players (and a very competent--albeit evil--GM). We have an appropriate venue for teaching, and while the barrier to entry exists, it's minimal. Thus, if the problem is just that someone needs actual play experience, or to talk to someone then that's one thing. However, sometimes someone just want to come and suck out all the help they can get and move on. These people should be driven away as they consume valuable resources and provide no lasting benefit. They don't leave good questions behind and they just frustrate the kinds of users that we actually want to keep.