We're all taught from an early age that it's nice to share. But not when it comes to your WoW account info. And I don't just mean e-mail scammers posing as Blizzard employees asking for your password. What I'm referring to is something that is something much more rampant and just as damaging to your WoW account's continued existence: willingly sharing your account information with a brother/roommate/guild mate/girlfriend, etc.
For those of you who don't know what I'm talking about, allow me to spell it out:
If you're caught sharing your account, Blizzard will ban that account.
You'd think this fact of WoW life would be well known, and I believe it is, but many players are choosing to ignore this rule at their own peril. Why? A few rationalizations seem to be popping up over and over.