I suppose because if people know about his existence and can't find him, they'll know something's up and start looking for secrets. They're supposed to come about it naturally. Like, the secrets are really well-hidden if the community isn't spoiling it for everyone and I'm pretty sure they're more rewarding if they don't just go on giving out hints upon request.
In fact, now that I think about it, these comments are spoilers sooooooooo