Hi; CloudFlare will continue to offer the discounted rate to domains already in your account; any new domains added to the Pro plan will be charged the full $20. If you have any questions, please reach out to our support desk.
Sorry, not good enough for me. You should have put some limits. Honestly, I have a bunch of domains you collect $5 from me monthly each, but I won't pay $20, no way, but I'm sure those don't cost you more than a $0.25/mo as they get no traffic! So, from customers like me, you will lose money, and I'm sure most domains are low traffic, and people use your service just in case! So, you're not making a smart decision!
Seriously, you looked smart before, now you look desperate and greedy!