One of my mage guildmates on Vallon was very fond of using AE nukes in mass pvp. This was high end, so we were all crossteamers. It took a lot more skill, luck and awareness to use AE spells in this setting. If your guild and group are immune, you could just spam those things without caring who all was around you. Not harming your allies is helpful for noobs, but it would end up being what everyone does, so the players that can actually do it without being too stupid are placed on the same level as the noobs. There were some very funny moments.
After a battle, he'd be like, "killed 4 of us, but got 7 of them!
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lol