binder,
Only about 5% of the affiliates most companies get end up being active, productive affiliates. So you will need to get more affiliates. Your payouts are fairly low compared to similar programs I have seen.
To learn more about growing a thriving affiliate program I will refer to you to my partner Linda Woods' site.
She has written some great articles.
http://www.partnercentric.com/pctogo.shtml
Read:
Top 10 Tips to Run a Successful Affiliate Program
and
What’s Mary Kay Got to do With Affiliate Marketing?