I've been mulling over ideas for team vs. team D&D campaigns (or any system really), where two or more teams of PCs compete for a particular prize and PvP combat is allowed.
All players would build characters at the same level & own the same amount of gold to spend on equipment, but otherwise could choose classes as they see fit. Perhaps players could hire NPCs and even field small armies.
A "scavenger hunt" campaign might be fun, where teams compete to bring back the most gold from several locations (dungeons, tombs, etc.), and no holds barred on attacking other PCs and stealing their loot. Or win the campaign if your team is first to grab the flag from a rival's fort and successfully bring it back to your own castle.
I'm imagining this would work best in a play be email campaign so that the DM can track the location of each team at every instant in game time (especially important if one team is laying an ambush!). Otherwise multiple DMs would be necessary.
Theoretically it sounds like fun . . . Has anyone tried this? Was it a logistics nightmare? Were players too cutthroat competitive?