Dark Sectors

Clans and Alliances own parts of the Solar System. They construct a Solar Rail then deploy to an open (or contested) area allowing everyone to play... but they set taxes on missions run there. Monopolies rise and fall. Territorial battles break out for honor... and profit.
 * 1) New locations are discovered in the Solar Map, with rarer resources, harder bosses, better loot... but they are unreachable.
 * 2) A Clan (or Alliance) can collaborate on building Tower to connect it to the Solar Rail network. When it is build and deployed all Tenno can now run missions there. In essence, they've built a solar toll-highway.
 * 3) All missions run there have taxes applied to them - resources and credits - this rate is set by the Clan who build the Tower.
 * 4) Competing clans can build their own tower (maybe in secret) to challenge the area. When this happens, the area is locked into Tower Sabotage mode (against Orokin defenders, not PvP) - the Clans (and all players they convince to help) chose a side and try to destroy the opposing Tower (like a player-driven Invasion).
 * 5) If a clan has built up Favor with a faction they can call them in - making their Tower more difficult to destroy as Grineer Elites are brought in to help.
 * 6) Political intrigue grows, towers are built in secret, counter-attacks sprung, and rousing pleas for support play out over days of bloody conflict.