Some ideas:
-In my opinion , you should make level 80's characters.
-You CAN NOT gain nor lose experience.
-Than you should make a statistics list with the most daily frags, weekly, montly, etc.
-Mayby its funny that peoples can start their own guild, with a maximum of 5 players. These peoples can't attack there own team mates. Than there will be a page at your guild, where you can see which member you killed from which guild.
-Make an arena where guild players 3 vs 3 can battle.
-Make a costum client, so players can't use bot, that would be very appreciated
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-If your guild, gots the most frags, the players of the guild will have a yellow skull.
-If you are the best fragger of the day, you will have a white skull, if you have the most frags of the week you will have a red skull and if you got the most montly frags, you will have a black skill.
-If a guild wins a war, so the guild killed ... amount of players of the other guild, all the players of the guild will receive something like soul orbs or gold coins/platinum coins/crystal coins. If you won like 10 war, better eq could be bought. (those items could also be donation items).
-People can donate to be a higher level.
-Make a few (large) areas and change by every 30 minutes, from position.
~Sentielo