Don't feel bad, WIS has much the same problem. For example: "If two or more teams in the same league are under the same account, they must be controlled by different people sharing that account, but not sharing the teams." That is actually a quote, cut and pasted from the "Fair Play Guidelines." Nowhere does it say how they can know who is using the computer or sharing the account. So, there seem to be three possibilities:
1. Do You Believe in Magic? {Does anyone remember the Lovin' Spoonful?}
2. They're just blowin' smoke ... again.
3. As in GD, they'll handle it on a case by case basis. Oh, wait, that's the same as #2.
I think part of the reason, maybe almost the entire reason, that there are so many discussions of "collusion" in the forums is that WIS itself allows it and at the same time struggles to act as if they don't allow it. They could simply disable any account whose owner is caught cheating, and cheating would almost disappear from the site. They choose not to. That is their choice. As with any individual, when you look at a corporation that says one thing and does the opposite, you must believe the behavior, not the empty talk.