It's pretty much common sense why current competition is better to display than competition that happened years ago.

I can't see why guilds with 1,000 hours feel like they deserve constant and special recognition for their achievments, it's a pretty easy feat a ton of guilds have done and it is not really anything worth dedicating a leaderboard too. Guilds that reached 5k/10k didn't do it to be #1 they did it because they enjoyed it and talking to any of them you can tell they don't care about leaderboards and they have recieved all the recognition amongst players they will get anyways.

If a new player joins a game and sees the current PK leaderboard has people with hundreds of thousands of kills it will probably kill all the competition that person has because passing them is near impossible, but when a new player joins and sees the leaderboard shows current competition then they are more likely to participate because they actually stand a fair chance, same goes with towering and baddy killing.

If you wasted your time doing something you didn't enjoy just to be on a leaderboard then it's kind of your fault, especially considering I don't think many people ever cared about the leaderboards that much aside from those on it.