Since scare tactics seem to be at least start thinking about the problem, or what compels some people to take rename your login url to secure your wordpress website a bit more seriously, let me shoot a couple of scare tactics your way.
Hackers don't have the power to come to a WordPress blog when you got all these lined up for your own security. You definitely can have a link WordPress account especially that one that gives you big bucks from affiliate marketing.
Before you can delete the default admin account, you first need to create a user. To do this go to your WordPress Dashboard and click on User -> Create New User. Enter all the information you need to enter.
BACK UP your site and keep a copy on your own computer and off-site storage. For those who have a very active site, back. You spend a lot of money and time on your site, don't skip this! Is BackupBuddy, no additional plug-ins back up plugins, widgets, your documents and database. Need to move your website to another host, this will do it!
I prefer using a WordPress news plugin to get the work done. Just make sure that the plugin you select is able to do backups, has restore performance, and can clone. Also be sure it is frequently updated to keep pace with all versions of WordPress. There's absolutely not any use in backing your data up to a plugin that is out of date, and not functioning.