Don,

What I was trying to say was, If you charge an affordable rate, Then your customers will be able to afford to change their site more often. Which will mean the site is never really done on their part either. You will get one large modification done, and they walk in the door with 2 other modifications. In between, they call with a correction here or there and an update to a name or number. Bottom Line, if the site makes money for the client, "a website is never done".