Renewing Account

This is our second year, and we received an email telling us to either register our team or renew it for $100. This seems sort of stupid and I was wondering if whether we had to renew it or if renewing was free.
Please tell me how it works. Thanks!

Registration is only for one season, every season you need to register again and pay for that season. By renew they might have meant keeping your team number and details and just paying again, as opposed to registering a whole new team.

I never knew we had to keep paying money every season though.
Thanks anyway!