Referral Reward

I'm a Southern Californian wedding photographer and I offer a referral reward for every referral that I end up booking.

It's something I've done for a while, but it it something interesting to other wedding vendors? It's given me some business so far, but wonder if it would be more effective within the wedding community. Does anyone else offer referral rewards? Like the "Tweet This" and Facebook tools on this site, I think a referral reward section would be good to get all the benefits of link exchanges without having to put a bunch of links on your site. Any thoughts?