Cloud Flare's model is to give you "unlimited" bandwidth with restrictions on how you can use it. If you do any kind of volume you quickly get a call from a sales person who wants to sell you enterprise. And then you end up paying a relatively high per-GB price as one big enterprise contract.

They're reasonably transparent about this, and I think it's fair. It's just not how I prefer to buy services.

At no point will we call you up and try to get you to spend more money to keep doing what you're already doing.