Entropia Universe has more than the land grab based pvp your list shows.
It also has lootable mining/hunting areas with more valuable resources.
Flying between planets is also lootable pvp with space combat.
With their newest planet Cyrene (still in its soft launch) there is arena pvp areas as well where competing players are temporarly given the same stats to keep the matches fair.
It is good to have a list of PvP games, but most of these games are imbalanced due to their Cash Shop, which gives power to the people. I don't know who would like to do a PvP in a game that requires you to spend money on power, just so you output the most damage and be "proclaimed" as best player. Also, none of these games ever made to the competitve scene or will ever get there.
However, good job on providing this list, that some players may find and enjoy those games.
I mainly made the list so I could avoid the games in the first post, the ones that force PK / etc. if other people get a gain on it as well, then more power to it. I'm glad that others can get a use out of it though.
Super Duper Uber Mega Ultra Extreme
i just wanted to say that Regnum Online and Realms Online (RO) are the same game. Realms Online is the game name they used when they expanded their offering to the US. Regnum is the original name starting in Argentina and spreading to Europe.
RO is the only RvR pvp (MOBA) game i know which does not have an imbalanced cash shop and has very good pvp balance. However, RO is a big open map so it is not like mini arenas yet. So sometimes you have to adventure a bit to find where the masses of enemy are (unless you are in a clan or in a party chat that has already foudn where the enemy is running).