Avoid ‘affiliate theft’ at all costs. There are several illegitimate methods of increasing your commissions, which are collectively referred to as ‘affiliate theft’ or ‘commission theft.’ As such, you’ll need to make sure you only use proper, disclosed links at all times. Otherwise, you might end up like the scammer who used affiliate theft to steal $28 million from eBay.
You should also make sure you aren't competing with your own affiliates for eyeballs. Any marketing channels you're using, such as search engines, content sites or e-mail lists, should be off limits to your affiliates. Put marketing restrictions into your affiliate agreement and notify partners immediately. It's your program--you set the rules. Or, if you prefer, you can let your affiliates run the majority of your internet marketing.