Spot on Iok!

At the other end of the gamut, I've personally experienced how one person with a gripe towards a guild leader rounded up 9 other players from 2 top guilds in order to clean an instance that we (him + 9 innocent guildies) had cleared halfway through on instance reset night, and Blizzard was not inclined to help us find the culprit at all.

Needless to say, the lust to remain a returning customer dropped below zero and even after we caught the miscreant it never rose again. I would be surprised if my tale turned out to be an exception to the rule...