Hey, I really don't want to pick on you OK, so please don't take this the wrong way....
You only have 18 posts, and it seems like half of them are complaining that you don't have karma....well look at some of the rest of us. I have almost a thousand posts, and there are some with quite a few more than me. You earn karma by participating in a discussion and maybe making a good point, or adding something to it. Coming up with a thought provoking or interesting topic can also earn you points. Of course, you can get points just for fun, but if there's no reason for it, then does it really matter? I think that karma is just something that is used to give like a high five to someone after a post.
So...get involved in some of the topics being discussed, ask more questions, and have fun. Karma is cool, but it's not essential in being a good "'Planet-eer."