Studying philosophy (not in a college class or some other structured environment) is an amazing experience. Truly understanding a given theory, thinking about it, comparing and contrasting it with others, etc, can (and for me, did) cause a profound change in one's worldview.
And once you start getting into it, you realize that we as humans don't understand anything. Even the philosophers know this. Things like truth, right or wrong, morality, words, ideas; all these things we take for granted as a constant, when they may not be. What is an idea? How can you know that someone understands the idea that you have? What is time? Anyone who's tripped knows that how we perceive time isn't even constant: our consciousness can be altered to make minutes feel like hours with a mere chemical. So then what is our mind? If it's a mere chemical process, why are we self-aware? Where does that awareness come from? If it's all chemicals, do we have free will? If it is just a chemical reaction, than we are just infinitely complex robots who, at the lowest level, cannot be any more responsible for our own actions than water is for turning to ice, yet if we do have conscious free will, than there's something beyond a mere complex chemical reaction going on up there in your noggin.
These are all extremely basic, yet never-endingly debatable, philosophical questions. To dismiss anyone trying to seek the truth to those questions as looney is, well, telling of the person doing the condemning. Don't get me wrong: I'm just as skeptical toward anyone who claims to have the answer to those questions and refuses to change their opinion (religious people, for example), but to close one's ears and skip through life ignoring these questions is no way to live, IMO.
Besides, it's fun to be able to blow your own mind trying to fathom all of existance, and what would exist if the universe was never created (and the paradox of existence without existence).