What, not more Ceasar's Legion players? I'm planning on becoming a scourge of the wastes, spreading seeds of chaos and pestilence among the land, while not outright killing innocents outside of quests if I can help it. If Ceasar's Legion is similar to the Slaver factions of past fallout games then I'm definitely there- but I hope I can leave a much more serious impact on the New Vegas world than just pissing off the other factions essential to the main quest.
People only care about the uniform. If the BOS didn't have power armor, players wouldn't give much of a crap about them.
Erm, how about the storeroom in Lost Hills in Fallout 1? Biggest weapons goldmine in the game. Too bad you have to kill half the Brotherhood to access it. As for Fallout 3, well, imagine how hard it would be assaulting the Enclave without the assistance of Liberty Prime and co.