If you refer a friend to BookIt (someone who uses our paid services), you earn 5 credits. Once you have earned 50 credits, which I know seems like I a lot but for good reason, because once you have, you earn a 30% discount on any author package or ad space package of your choice. 30% may not seem like much but it really does take quite a bit off! And really, you only need to refer 10 paying customers. Also, at this time, there is no limit to how many times you may earn this refer-a-friend reward. This may change in the future. So please, if you refer someone to us, please make sure they let us know!