I don't find them too expensive, especially compared to Referral Candy. They were charging me $15 (min) per month which would have been $180 in one year, plus they wanted I think it was 7.5% of every sale, which the $15 dollars could be rolled into that, but if you made less in sales than that you still had to pay the $15 dollars. Either way, seemed to me like a rip off after a while. In one month I only had 4 clicks to my Etsy shop, and nobody had a successful referral. So I figured spending $45 dollars in 800 minicards seemed more viable. I just love the idea of referrals, but at the same time I have no experience of how effective the whole thing is.