One of the nice things about not having documentation is that only those that take the time to explore and learn can exploit the feature. On the contrary, when documentation exists, not reading it would put you at a disadvantage.
Nobody said anything about a massive time investment. When I said "take the time to explore and learn", I just meant somebody who does it, as opposed to someone who doesn't.
In my opinion, putting options in a game for people who want to discover mechanics on their own and be rewarded for it is appealing. It goes along with the hacker mentality.
It's a subjective opinion...you don't have to agree with me.