Is there a monthly / yearly fee for a "Pro" site?

Instead of introducing a subscription fee for each of your sites, our plans are made simpler. The Pro Lite / Pro / Pro+ upgrades are for a user's account and all user's Sites are promoted to Pro Lite / Pro / Pro+ status automatically. This is very different from what other wiki providers are offering and have a few key benefits:

• easier management of subscriptions
• much lower costs