4. Don't abuse multis.
This is a tricky one. It's not against the rules to have more than one character per household, or per computer, or even per person. What is against the rules, however, is to have a bunch of extra characters that act as item or Meat farmers for your main character.
It's also against the rules to have a bunch of extra characters that form a clan, for the purposes of getting discounted beer, foties, and stat boosters.
Here's a yardstick: If your main character is advancing at a rate faster than would be possible without multis, then you're more than likely in violation of this rule.
If you're abusing multis, and your behavior is noticed, all accounts other than what appears to be your primary will be disabled. If you make a bunch more multis and start doing it again, your primary will be disabled.
It is especially against the rules, and makes me really angry, if you keep creating new accounts, using their initial 80 adventures, sending all of the stuff to your primary and then deleting the account. This action will result in the IMMEDIATE deactivation of all of your accounts, and potentially in your IP being banned. DO NOT DO THIS.