Bk stat records how many times you killed a baddy.
If you stand in one spot spamming sword to kill the same bandit again and again, chances are you will not make the leaderboard even if you bot that 24/7. There is a skill to bk that is not standing in an optimal spot and spamming sword, believe it or not.
Pk (cuz I'm assuming that's what you're praising) records how many times you killed a player. They could be noobs fresh from balamb or fervent sparrers. They could be strangers or friends letting you 'boost.' Chances are, if you're not spamming bow/bomb in a pk mob, you won't make the leaderboard.
House likes, on the other hand, require dedication. You gotta be out on that corner slanging codes like a mofo all day long to get them likes. If you've read to this point, you might realize how silly it is to argue any of these points.