Although I have many client accounts on my cPanel based server I'm really the only one who has login information to any of the accounts. I have cPhulk setup to alert me and blocking after 4 failed attempts. I usually have only a handful of bots trying to get in each day(2 hosts ago I never had any), but Today the rate has significantly increased, every 10 minutes or so(no not like clockwork, just averaging). Should I be concerned? Is there anything extra I should be doing, is there any automated reporting services I can use? Thanks.
Make sure that you're using strong passwords, encourage your users to use strong passwords, report all incidents to abuse departaments and/or here: US-CERT Incident Reporting System
Other than that there's no much you can do about that, unless you want to do some coding.