Anyone see a big jump in renewal fees with GoDaddy?

I use GoDaddy just as my registrar and currently have 20 domains with them. I have several coming up for renewal in April and was shocked to see that they had jumped by at least 30% over last year. I did find that if I renew over 5 at once, it gives me a bulk discount which will help but still - anyone know why such a large increase?