^
Once a guide has been sold, and they're is a seller; no one else is allowed to sell it.
If it's a guide with the same method, the thread will simply be locked.
If it's a guide that's word for word with another, the user will be banned for attempting to re-sell guides. (I'm not sure if this is permanent, or not)
If they're is no current market for the guide, and it's not leaked; you shouldn't have a problem.
IMO.