The following games are some of the top and most famous P2P (Pay-To-Play) MMORPG’s on the internet that you an find. Some have a trial version before you have to start paying to play it. Others do not.

1. World Of WarCraft: This famous MMORPG is known as the best one ever yet created better than any other P2P game out there. Although it is one of the most expensive, its abundant amount of players shows how much it is worth playing.
   
2. Eve Online: This MMORPG is known as the best for science fiction and for its in-game economy. Definately one of the MMORPG’s ever seen.
3. Final Fantasy XI:This MMORPG is known as the second best for fantasy, WoW in the lead. The storyline is known to be one of the best, enjoyable gameplay, and much more.
4. City Of Heroes/City Of Villains: These two MMORPG’s are known for their uniqueness and for their casual game players. City Of Villains was launched after the success of City Of Heroes.
5.  Dark Age Of Camelot: One of the greatest MMORPG’s for Player-Versus-Player (PVP) combat because of its three realm system. It has remained one of the steadiest MMORPG’s that has ever existed over a long period of time.

There are many other great and famous P2P MMORPG’s out there, but those are the well and best known to be the greatest ones.

Note: The list might become a Top 10 list.