willybfriendly - 11:24 pm on Jan 19, 2011 (gmt 0)
I agree with Bill. Customers do not tend to keep up their own sites - CMS or not.
Further, there is ongoing maintenance and security upgrades that are beyond the ability of most end users.
Thus, be sure to propose a maintenance contract with every such site. I regularly offer an "up to X hours" for a flat annual rate. If they go over the limit it becomes hourly.