Understood. But again I will state.
If you want to solicit more traffic. Meaning that your site is more visible.
Then how do you propose to limit one person from visiting your site?
Your current options are limited.
If you have a ip,you can ban that. But then what?
Or ban the user. But they can just register as another user.
Banning by email is the same story.
I have three email addresses I use every day. And I could add more.
So I guess the real question is what do you really need . More visitors, or Not!
Your question is a little ambiguous.
