DAOC had its keep system. Players would attack a keep to claim it for their faction. The owner of the keep would try to defend it.
This was very unique in that it not only worked, but was the biggest selling point for DAOC.
Now EVE has something similar in Player Owned Stations (POS) but the issue is is that for someone to take these down, it requires a ton of planning. in the end, its just a boring affair that results in a lot of ordinance being thrown at a target.
However, aside from bragging rights, there was not much in terms of a reward once a guild claimed a keep.
to throw some ideas out there:
Two styles of Outpost. One is static, the other is Player controled. The static outposts are basic in nature, allows for minor modifications (upgrades of weapons/walls) enables employment of basic NPCs (basic vendors, field repairs) and allow for a source of income (income could be money or resources). They cannot be destroyed, and require minimal upkeep.
The player controled is one where the player gets to build it as they see fit. They provide 100% of the materials needed for buildings and defenses, Can be as large as they wish (as long as it does not encroach on existing territory), enables the employment of NPCs (vendors, full repairbays, etc) requires upkeep based on size/services (can get expensive very quick). and can be destroyed.
I realize this is probably a phase two deal, but wondering what is planned in re. to player owned structures and PvP.