The sections on gambling tend to apply to commercial use. In-game games of chance, raffles, races, etc., assuming that the prizes are in-game only, are not strictly prohibited and we only restrict against the advertisement of them in-game or on our forums.
Keep in mind these activities are not supported and you participate in them at your own risk. Our staff would be unable to provide direct assistance or reimbursement if there was a scam. This is also specific for the North American version of the game as other regions may have different restrictions.