For this reason, it would be great is Wordfence enabled a feature whereby we could nominate the specific common hack usernames such as "admin" to permanently block.
This will be in the next release. But don't take my word for it. My co-founder Kerry posted this about 20 minutes ago:
http://wordpress.org/support/topic/large-number-of-failed-logins?replies=3#post-5545076
@DavidBrugge My humble apologies sir. As an advocate for our product I'd like to assure you that we're not resting on our laurels and are taking note of your feedback. There were some core features and fixes we needed to get into the product before we could get on to other feature requests and these caused a delay in us implementing this feature. I can assure you that it will be in the next release and the timeline for this is that we will be releasing a Beta on approximately Friday this week with the production version coming out the following Sunday or Monday depending on how many issues are reported by our Beta testers.
I'm a bit nervous about marking this resolved, but I'm going to go ahead and do that and please trust me that this will be in the next release.
Regards,
Mark.