Do you really want to delete your account or just want show show your anger for the right steps taken by webmaster. As per WMs response you have been warned several times not to copy, still you did the same.
There are few members who worked hard for this site and several new members are coming and giving there best efforts, initially many did some mistakes due to ignorance but after proper instructions they are now reputed members. None of them left the site or asked to delete their account as they had some thing to present on their own.
In your case I think as you are still continuing coping means you have nothing to present on your own, in that case it doesnt matter whether your account is there or not because neither you are going to do any good for the site neither the site will do. And please dont talk about hurting ego or term begging. Yes you are not here for begging, but even you are not allowed to steal, posting copied articles and then to expect anything is like stealing. Be honest and let the site deal with you honestly.