Thanks. They say you learn something new everyday... you just made my day!
I have written content for the web for over 10 years and I use copyscape to check my own website content as well as checking content my clients send me for editing and finding those who have copy-pasted what I have written to their websites. The reason I check my own content is because there are tons of other writers who have websites and a lot of us have pretty similar ideas. I want to make sure that while I need to express those ideas to my potential clients, I have done it in a way that they see the content on my site is 100% original, just like the content I will write for them.