Open world pvp is great, but like puppychow mentioned, I don't think you're going to find a lot of resistance when you go to kill the city leaders. A few members of this dual-boxing community have killed some of the city leaders with anywhere from 5-10 characters. I believe zzc2 posted some screenshots of a few of his city leader kills. If the localdefense channel is spamming you, you can simply turn it off to ignore those messages. I think you'd find a better fight if you went after the auctioneers in one of the capital cities (this way you'd at least irritate people), but then again, people would probably just head over to the next city rather than deal with your army of 40+ guys. WoW is more of a game that tailors to rewards, rather than to pvp. Yes we have arenas (which reward great stuff), battlegrounds (not sure how you'd handle any of these if you were the sole person in a bg - except for maybe WSG -- you'd block the hell out of the flag :P ), and the SoTA/Wintergrasp, but that's about it. Open world pvp has very little to offer in terms of rewards, and since there are very few rewards, people most likely won't care about what you're doing in the open areas.

Cheers! I look forward to seeing screenshots of your team.