Well, the other thing on FB is that (if I'm not mistaken) if you've "liked" something you tend to get their info/notices as well as have their name show up in things you've "liked", so they get exposure through several avenues from that "like".

With that said, I'm worried about gaming and ego-stroking as an unwanted side-effect here. At the very least, if this is implemented I would like to be able to totally disable the function (i.e. "See no likes, get no likes, offer no likes").