It works for me & I've used it myself. It's really hard to promote something you haven't personally used and loved. A good example of this for me would be FlexJobs. I get a lot of questions about this program. If someone asks me where to find something in the dashboard, I can tell them. If they tell me they aren't finding ANY jobs to apply to, I can provide them with a list of steps that may change that. If they ask me if I pay for a membership myself, I can, with 100% honesty, say YES.
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.