I guess it depends if is a 1-time referral or a whole life affiliate referral. If you look at our referral program we offer a 1-time program or you an affiliate program. I haven't heard of anyone offering over 4% of the referrals rakeback but you I guess you never know.
http://www.rakebreak.com/faq.php?qpage=1&a_id=15
http://www.rakebreak.com/faq.php?qpage=1&a_id=16