Then you already have Fortune Seeker active. It activates automatically once you have at least 10 points spent in the tree. You do not need to, and indeed cannot, actually put points into it.
I didn't get that at all when I got my first 50 with enough CP to access things like that. I kept trying to click on that (or whatever) to enable it....
I finally looked it up on one of the wikis. Otherwise I'd still be wondering what the hell. Lot of stuff in this game that's not obvious or transparent.
Then again.... I've had that same thought about the other MMOs I've played....