As freelancers with us, it is clear that you deal with new work all the time. You are doing one assignment after another on widely differing topics, under tight deadlines. Furthermore, you are usually working by yourself. It is really hard to do this all without guidance, or a lot more detailed instructions than we usually receive from customers!
A lot of you use samples, as a visual aid to structure your work, or to help understand a particular topic. But some of you, sometimes, take this practice in the wrong direction; by using these samples as your own work, or simply ripping them off.
Shame on you, if you actually use the text of a writing sample in your own papers. You need to realize that you are committing plagiarism by doing this is illegal. That poses a huge risk to your position with us.