I charge them monthly - they could clone to their own under your free account and think I'm ripping them off
For non-technical editors, it can add extra confusion (this is the entire base of who I make websites for, they are not technical at all - most hate the idea of having a website even)
Yes to everything @Jeremy says. Overall, less is more when it comes to clients. Don't show them anything unless it is absolutely necessary. It's better for them and better for us. To me cloning a website is an Admin feature, not an editor feature. An employee of a business should not have the option to clone that orgs website.